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Safety

Check out our top-notch semi-truck universal safety products at 4 State Trucks. From durable placard holders to reliable reflective tapes and sturdy air hoses, we've got your safety covered. Need a new coupler or a pogo stick? We have those too. Equip your rig with the best gear and stay safe on the road!
  • Product
  • Qty in Cart
  • Quantity
  • Price
  • Subtotal
  • 10 Ft Black Jacketed 7 Way 14 AWG Trailer Wire

    10 Ft Black Jacketed 7 Way 14 AWG Trailer Wire

    UNITED PACIFIC

    $35.99
    Black Jacketed 7 Way 14 AWG Trailer Wire 10 Ft* High Quality Trailer Wire* 14 AWG* 7 Way* Jacketed* Black* 10 Foot Length* Sold Individually* Warranty On Trailer Wires Against Defects In Workmanship...
    09-16030529
    SKU:
    09-16030529
    Product Type:
    Air, Electrical, & Safety
    $35.99
    Qty in Cart: 0
    Price:
    $35.99
    Subtotal:
  • FREE SHIPPING OVER $249
    6-1 AWG 3 Way Top Post Terminal

    6-1 AWG 3 Way Top Post Terminal

    UNITED PACIFIC

    $18.99
    3 Way Top Post Terminal 6-1 AWG* High Quality Battery Terminal* 3 Way Top Post* 6 To 1 AWG* 1 Positive/1Negative* Sold As Pack (2)* Warranty On Battery Terminals Against Defects In Workmanship &...
    09-16030531
    SKU:
    09-16030531
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $18.99
    Qty in Cart: 0
    Price:
    $18.99
    Subtotal:
  • FREE SHIPPING OVER $249
    2 Single Cavity Weather Pack Kit W/ Male & Female Connector Housing

    2 Single Cavity Weather Pack Kit W/ Male & Female Connector Housing

    UNITED PACIFIC

    $6.99
    Weather Pack Kit 2 Single Cavity W/ Male & Female Connector Housing* High Quality Weather Pack Kit* Has Everything Needed To Make 2 Single Cavity Weather Pack Connector* Includes:  - (2) Male...
    09-16030515
    SKU:
    09-16030515
    Product Type:
    Air, Electrical, & Safety
    $6.99
    Qty in Cart: 0
    Price:
    $6.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Female Flag Style Terminal 16-14 AWG W/ Crimp Seal Heat Shrink & Brown Wood Colored Rim 5 Pack

    Female Flag Style Terminal 16-14 AWG W/ Crimp Seal Heat Shrink & Brown Wood Colored Rim 5 Pack

    UNITED PACIFIC

    $6.99
    5 Pack Female Flag Style Terminal 16-14 AWG W/ Crimp Seal Heat Shrink & Brown Wood Colored Rim* High Quality Terminal* Female Flag Style* 16-14 AWG* Crimp Seal Heat Shrink* 1/4 Inch Tab* Brown Wood...
    09-16030521
    SKU:
    09-16030521
    Product Type:
    Air, Electrical, & Safety
    $6.99
    Qty in Cart: 0
    Price:
    $6.99
    Subtotal:
  • Red Fire Extinguisher Case W/ Clear Window & Internal Nylon Support Ring For 13 To 20 Lb Extinguishers

    Red Fire Extinguisher Case W/ Clear Window & Internal Nylon Support Ring For 13 To 20 Lb Extinguishers

    BAWER TOOL BOXES

    $75.99
    Fire Extinguisher Case Red W/ Clear Window & Internal Nylon Support Ring Fits 13 To 20 Lb Extinguishers* High Quality Fire Extinguisher Case* Made Of Plastic* Holds From 13 To 20 Lb Extinguishers *...
    09-054119
    SKU:
    09-054119
    Product Type:
    Air, Electrical, & Safety
    Ready To Ship:
    Yes
    $75.99
    Qty in Cart: 0
    Price:
    $75.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Copper Primary Wire W/ Smooth Surface, Stranded Annealed & Options

    Copper Primary Wire W/ Smooth Surface, Stranded Annealed & Options

    UNITED PACIFIC

    $7.99 - $8.99
    Choose Option(s) to see description.Fitment** Universal - Fits Multiple Makes & Models Of TrucksGreen 18 Gauge Copper Primary Wire 30 Ft Length W/ Smooth Surface & Stranded AnnealedPrimary Wire 30 Ft...
    PPR_301271
    SKU:
    PPR_301271
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $7.99 - $8.99
    Qty in Cart: 0
    Price:
    $7.99 - $8.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Rocker Switch Caling Style W/ Options

    Rocker Switch Caling Style W/ Options

    UNITED PACIFIC

    $15.99
    Choose Option(s) to see description.Fitment** Universal - Fits Multiple Makes & Models Of TrucksBlack 1 Piece Rocker Switch Carling Style On/Off W/ Single Post, Single Throw1 Piece Black Rocker...
    PPR_301279
    SKU:
    PPR_301279
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $15.99
    Qty in Cart: 0
    Price:
    $15.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Toggle Switch 1 Piece W/ Position Options

    Toggle Switch 1 Piece W/ Position Options

    UNITED PACIFIC

    $15.99 - $20.99
    Choose Option(s) to see description.Fitment** Universal - Fits Multiple Makes & Models Of TrucksOn/Off Toggle Switch 1 Piece W/ 2 Prong Connection1 Piece On/Off Toggle Switch W/ 2 Prong Connection*...
    PPR_301278
    SKU:
    PPR_301278
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $15.99 - $20.99
    Qty in Cart: 0
    Price:
    $15.99 - $20.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Bosch Style Relay Switch W/ 30/40 AMP 12V Tab

    Bosch Style Relay Switch W/ 30/40 AMP 12V Tab

    UNITED PACIFIC

    $8.99
    Bosch Style Relay Switch W/ Standard 5 Pin Relay* High Quality Relay Switch* Bosch Style* Standard 5 Pin Relay* 30/40 Amp 12V Tab* Sold Individually* Warranty On Relay Switches Against Defects In...
    09-16190911
    SKU:
    09-16190911
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $8.99
    Qty in Cart: 0
    Price:
    $8.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Bosch Style Relay Harness 14 AWG & 18 Foot Leads

    Bosch Style Relay Harness 14 AWG & 18 Foot Leads

    UNITED PACIFIC

    $9.99
    Bosch Style Relay Harness W/ Standard 5 Pole Relay Plug* High Quality Relay Harness* Bosch Style* Standard 5 Pole Relay Plug* 14 AWG* 18 Foot Leads* Sold Individually* Warranty On Relay Harnesses...
    09-16190912
    SKU:
    09-16190912
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $9.99
    Qty in Cart: 0
    Price:
    $9.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Battery Isolator Switch W/ Hardware & 2 Keys

    Battery Isolator Switch W/ Hardware & 2 Keys

    UNITED PACIFIC

    $20.99
    Battery Isolator Switch W/ 2 Keys & Hardware* High Quality Battery Isolator Switch* Includes:  - (2) Keys  - Hardware* Sold Individually* Warranty On Battery Isolator Switches Against Defects In...
    09-16200204
    SKU:
    09-16200204
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $20.99
    Qty in Cart: 0
    Price:
    $20.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Spring Brake Valve W/ 3/8 Inch NPT Control & Supply Port Replaces 170.110171

    Spring Brake Valve W/ 3/8 Inch NPT Control & Supply Port Replaces 170.110171

    AFTERMARKET

    $72.99
    Spring Brake Valve W/ 1/2 & 3/8 Inch Reservoir Ports, 2 - 3/8 Inch Delivery Port* High Quality Spring Brake Valve* Protected Reservoir Spring Brake Control Valve* Control And Supply Ports Are...
    09-05170509
    SKU:
    09-05170509
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $72.99
    Qty in Cart: 0
    Price:
    $72.99
    Subtotal:
  • FREE SHIPPING OVER $249
    MV3 Dash Valve W/ Integral Push=Lock-Connect Fittings & 4 M6 X 1 - 6H Mounting Holes Replaces 170.800622WF, 5006257

    MV3 Dash Valve W/ Integral Push=Lock-Connect Fittings & 4 M6 X 1 - 6H Mounting Holes Replaces 170.800622WF, 5006257

    AFTERMARKET

    $200.99
    MV3 Dash Valve 5.8 X 1.5 Inch C To C W/ 5 - 3/8 Inch PLC Ports* High Quality Dash Valve* MV3 Type Dash Control Module With Integral Push-Lock-Connect Fittings* Trailer Trip Pressure 25-45 PSI*...
    09-05170508
    SKU:
    09-05170508
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $200.99
    Qty in Cart: 0
    Price:
    $200.99
    Subtotal:
  • FREE SHIPPING OVER $249
    T18/24 Disc Brake Chamber W/ 2.5 Inch Ram Stroke & 4 Inch Push Rod Replaces 179.SB1824DB, LCP1824D

    T18/24 Disc Brake Chamber W/ 2.5 Inch Ram Stroke & 4 Inch Push Rod Replaces 179.SB1824DB, LCP1824D

    AFTERMARKET

    $162.99
    T18/24 Disc Brake Chamber 9.125 Chamber Height & 4.75 Inch C To C Mount Hole Distance* High Quality Disc Brake Chamber* T18/24 Disc Brake* Spring Brake Chamber Type* (2) M16 - 1.5 X 1.75 Inch...
    09-05170510
    SKU:
    09-05170510
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $162.99
    Qty in Cart: 0
    Price:
    $162.99
    Subtotal:
  • FREE SHIPPING OVER $249
    FF2 Type Full Function Trailer Valve W/ 2 Way Check & 4 Port Relay Valves Replaces 170.KN28601

    FF2 Type Full Function Trailer Valve W/ 2 Way Check & 4 Port Relay Valves Replaces 170.KN28601

    AFTERMARKET

    $118.99
    FF2 Type Full Function Trailer Valve W/ Control, Spring Brake, Supply, Reservoir & Delivery Ports* High Quality Trailer Valve* FF2 Type Full Function Valve* Combines The Functions of Pressure...
    09-05170504
    SKU:
    09-05170504
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $118.99
    Qty in Cart: 0
    Price:
    $118.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Air Brake Inversion Valve W/ Dust Shield On The Exhaust Port Replaces 14449, 280758

    Air Brake Inversion Valve W/ Dust Shield On The Exhaust Port Replaces 14449, 280758

    AFTERMARKET

    $58.99
    Air Brake Inversion Valve W/ 0.28 Inch Mounting Holes, Delivery, Supply & Control Ports* High Quality Air Brake Inversion Valve* Inlet Opening Descending Pressure Common Control: 45 PSI* Exhaust...
    09-05170505
    SKU:
    09-05170505
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $58.99
    Qty in Cart: 0
    Price:
    $58.99
    Subtotal:
  • FREE SHIPPING OVER $249
    MV3 Type Dash Valve W/ Integral Push-Lock-Connect Fittings Replaces 170.KN20619, 20560009

    MV3 Type Dash Valve W/ Integral Push-Lock-Connect Fittings Replaces 170.KN20619, 20560009

    AFTERMARKET

    $156.99
    MV3 Type Dash Valve 3.5 X 5.33 Inch C To C W/ 4 0.3 Inch Diameter Bolt Holes & 6 - 3/8 Inch PLC Ports* High Quality Dash Valve* MV3 Type Dash Control Module With Integral Push-Lock-Connect Fittings*...
    09-05170506
    SKU:
    09-05170506
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $156.99
    Qty in Cart: 0
    Price:
    $156.99
    Subtotal:
  • FREE SHIPPING OVER $249
    BPR1 Type Brake Proportioning Relay Valve W/ 5.5 PSI Crack Pressure & Mounting Bracket Replaces 170.065146

    BPR1 Type Brake Proportioning Relay Valve W/ 5.5 PSI Crack Pressure & Mounting Bracket Replaces 170.065146

    AFTERMARKET

    $61.99
    BPR1 Type Brake Proportioning Relay Valve W/ Control, Service, Supply & Deliver Ports* High Quality Relay Valve* BPR1 Type Brake Proportioning Relay Valve* 5.5 PSI Crack Pressure* Mounting Bracket...
    09-05170500
    SKU:
    09-05170500
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $61.99
    Qty in Cart: 0
    Price:
    $61.99
    Subtotal:
  • FREE SHIPPING OVER $249
    SR7 Type Spring Brake Modulating Valve Replaces 170.K021558

    SR7 Type Spring Brake Modulating Valve Replaces 170.K021558

    AFTERMARKET

    $162.99
    SR7 Type Spring Brake Modulating Valve W/ Control, Balance, Supply & Delivery Ports* High Quality Spring Brake Valve* SR7 Type Spring Brake Modulating Valve* Ports:  - (1) 1/4 Inch NPT Control Port ...
    09-05170501
    SKU:
    09-05170501
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $162.99
    Qty in Cart: 0
    Price:
    $162.99
    Subtotal:
  • FREE SHIPPING OVER $249
    MV3 Type Dash Valve Control Module W/ Integral Push-Lock-Connect Fittings Replaces 5009234, 801360

    MV3 Type Dash Valve Control Module W/ Integral Push-Lock-Connect Fittings Replaces 5009234, 801360

    AFTERMARKET

    $152.99
    MV3 Type Dash Valve 4.21 X 3 Inch C To C W/ 4 - .0275 Inch Diameter Bolt Holes* High Quality Dash Valve* MV3 Type Dash Control Module With Integral Push-Lock-Connect Fittings* Auxiliary Port Not...
    09-05170502
    SKU:
    09-05170502
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $152.99
    Qty in Cart: 0
    Price:
    $152.99
    Subtotal:
  • Total: items /

Adding your products to cart

Shop Semi Truck Safety Parts & Accessories

Stay prepared with essential emergency equipment for your semi truck. We stock heavy-duty truck safety accessories and parts needed to ensure your commercial vehicle meets strict FMCSA and DOT regulations. Made to be durable and with universal fitment across semi-truck make/models, adding the right aftermarket safety hardware can prevent out-of-service violations with proactive maintenance.

Critical Safety Parts for Air Brakes & Pneumatic Components

Support your rig’s stopping power and stay DOT compliant with aftermarket semi truck air dryers and cartridges, control valves to regulate flow between the tractor and trailer, and air pressure monitoring systems for real-time, accurate reads on system pressure.

Secure Tractor-Trailer Hookups

Secure your back of cab setup with coiled lines, gladhands, and organizational support hardware, like pogo sticks and stainless-steel airline box backplates.

Roadside Emergency Compliance Equipment

Explore a wide selection of FMCSA regulation-backed compliance equipment like fire safety products, hazard management items like duo-flip placard holders to label toxic materials, or DOT-C2 reflective tape with self-adhesive reflectors to ensure safety during roadside inspections and emergency repairs. You can also find a variety of maintenance hardware, like brass compression fittings or nylon wire ties, and professional supplies, like respirator masks for detailed paint or polishing work.

Tractor-Trailer Electrical System & Wiring Setup

Find everything you need to properly connect and power the trailer’s lights and ABS system with aftermarket cables and cords, including 7-way Green ABS coiled cables, and straight cable assemblies. Organize your 12- to 14-gauge electrical wire with bulk wire rolls. Quickly replace damaged ABS sensors (straight and 90-degree) in various lengths (18" to 96") and maintain the Anti-lock Braking System's functionality.

Frequently Asked Questions About Universal Safety

What kinds of products are included in this category?

This category covers general safety equipment and accessories used in and around semi-trucks, such as warning triangles, road flares, fire extinguishers, first aid kits, wheel chocks, safety vests, and similar items that help drivers stay prepared for roadside emergencies and everyday safety needs.

Will these safety items meet DOT requirements?

Many of the items in this category, such as warning triangles and fire extinguishers, are designed to align with common DOT expectations for emergency equipment. However, requirements can vary by state, vehicle type, and cargo, so we recommend checking current DOT regulations or consulting your fleet safety officer to confirm a specific product meets the requirements for your operation.

Are these products universal, or do they fit specific truck makes and models?

Because these are general safety accessories rather than vehicle-specific parts, most items are designed to work across different truck makes and models. Mounting brackets or storage cases, where applicable, are typically made to fit a wide range of cabs, but we suggest checking individual product listings for any size or mounting details before ordering.

How should I store and maintain this equipment in my truck?

Safety equipment should be stored somewhere easily accessible in an emergency, such as under the seat, in a door pocket, or in a dedicated storage case. Items like fire extinguishers and first aid kits should be checked periodically for expiration dates, pressure levels, or general wear, and replaced or restocked as needed to make sure they are ready to use when needed.

How often should I replace or restock these safety items?

This depends on the specific product. Fire extinguishers usually have a gauge or indicator showing when they need to be serviced or replaced, first aid kits should be restocked after use or when supplies expire, and reflective triangles or flares should be inspected regularly for cracks, fading, or damage. Checking your equipment during routine truck inspections is a good habit to help keep everything ready for use.


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