Nylon PLC Plug - DOT 1/2" Push-to-Connect Air Brake Port Plug - Parker 639PMT8 177.11508
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Fitment
Fits these trucks
Universal - Class 8 trucks and commercial trailersAir brake plumbing on tractors and trailersSeals unused 1/2 in push-to-connect (PLC) ports
Always confirm your year, make & model before ordering.
Part numbers
OEM & interchange numbers
1 cross-refParker 639PMT8
Direct 1-to-1 replacement for every number above. Tap any number to copy.
Overview
Close off an unused push-to-connect port for good with this Nylon PLC Plug distributed by FleetPro Parts & Tires. It seats into a 1/2 in DOT push-to-connect fitting and seals it, which is exactly what a truck needs when a circuit gets rerouted, an accessory comes off the frame rail, or one leg of a manifold stops being used. An open or half-sealed port bleeds the system down overnight, keeps the compressor cycling, sets off the low-air buzzer on a cold morning, and can leave the spring brakes dragging on the first pull of the day. We stock these heavily right here in our Hanover Park, Illinois warehouse to ensure lightning-fast shipping for fleets, diesel repair shops, and owner-operators nationwide.
A Clean, Permanent Seal: The 1/2 in Nylon PLC Plug Advantage
This is a purpose-built nylon push-to-connect plug, not a shop-made stopper. It carries the same 1/2 in tube profile the fitting was designed to grip, so the collet closes on the plug exactly the way it closes on a length of DOT nylon tubing. There is no thread sealant to cure, no flaring tool to dig out, no adapter stack to build, and no reason to cut the line back to fit a cap. Push it home, tug-test it, and the port is finished.
Because it belongs in air brake plumbing on tractors and trailers, it meets FMVSS 571.106 / DOT requirements for brake circuits โ an important distinction the moment an inspector traces a plugged port back to a service or emergency line. At 0.1 lbs it costs almost nothing to keep a few in the toolbox, and having one on hand turns a bled-down, abandoned port into a two-minute fix. At FleetPro Parts & Tires, this plug is a direct replacement for the highly searched industry number Parker 639PMT8.
Vehicle Fitment & Compatibility
This DOT air brake plug uses a universal design intended for the following commercial applications:
- Make/Model: Universal - Class 8 tractors, commercial trailers and vocational trucks
- System: Air brake plumbing on tractors and trailers
- Port Size: 1/2 in push-to-connect (PLC)
- Compliance: FMVSS 571.106 / DOT requirements for brake circuits
Direct Replacement & Cross-Reference Numbers:
This Automann plug serves as a direct replacement for the following part number:
- Parker Interchange: 639PMT8
- Automann Distributor #: 177.11508
Technical Specifications
- Component Type: Nylon Push-to-Connect (PLC) Plug
- Tube Size: 1/2 in
- Function: Seals unused PLC ports
- Compliance: FMVSS 571.106 / DOT
- Weight: 0.1 lbs
- Package Dims: 1.9 x 0.58 x 0.58 in
- UPC: 889626030147
- Product Level: Fleet Standard Aftermarket
- Brand: Automann (Distributed by FleetPro Parts & Tires)
Key features
- Seals Retired Ports For Good: Closes an open 1/2 in PLC port so an abandoned circuit stops bleeding the air system down overnight.
- No Tools, No Sealant: The push-to-connect design seats by hand, so the port is closed without flaring, threading or thread dope.
- DOT Air Brake Compliant: Meets FMVSS 571.106 / DOT requirements for brake circuits, so a plugged service or emergency leg still passes inspection.
- Matched Nylon Profile: The nylon body carries the same 1/2 in tube profile the collet was built to grip, so it holds like a proper tube end instead of an improvised cap.
- Direct Parker Replacement: Interchanges with Parker 639PMT8, so it can be ordered by the number already on the shop's parts list.
Specifications
Component Type
Nylon Push-to-Connect (PLC) Plug
Tube Size
1/2 in
Function
Seals unused PLC ports
Compliance
FMVSS 571.106 / DOT
Weight
0.1 lbs
Package Dims
1.9 x 0.58 x 0.58 in
UPC
889626030147
Product Level
Fleet Standard Aftermarket
Questions
Will this fit my truck?
This part fits Universal - Class 8 trucks and commercial trailers, Air brake plumbing on tractors and trailers, Seals unused 1/2 in push-to-connect (PLC) ports. Always confirm your year, make and model before ordering.
What part numbers does it replace?
Yes. It is a direct replacement that interchanges with Parker 639PMT8.
How fast does it ship?
In-stock orders placed before 12 PM Central on business days ship the same day from our Hanover Park, IL warehouse, and typically arrive in 2 to 5 business days anywhere in the USA.
What's your return policy?
Unused items in original packaging can be returned within 30 days, backed by our 30-day money-back guarantee. If we ship the wrong part, we cover the return label and send the correct one.