Brass Push-to-Connect (PLC) Male Connector - 1/2" Tube x 1/4" NPT DOT Air Brake Fitting 177.13B688B

Keep the air where it belongs with this Brass Push-to-Connect (PLC) Male Connector distributed by FleetPro Parts & Tires. It ties 1/2 in DOT air brake tubing straight into a 1/4 in male NPT port with one firm push — no flaring tool, no compression sleeve, no special dies on the side of the road. A weeping or cracked fitting on a brake circuit is the kind of fault that never fixes itself: the compressor cycles all day, the low-air buzzer finds you on a grade, and an audible leak on a brake line is exactly what puts a truck out of service at the scale. 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.

Leak-Free Air Lines: The Brass PLC Male Connector Advantage

This fitting is built with a brass body and collet, and that detail is what separates a fitting you install once from one you fight again next winter. Brass does not scale up and seize the way plated steel does after a few seasons of road salt and washdowns, and it does not go brittle like the plastic collets used on economy fittings. The 1/2 in tube end accepts a squarely cut tube and holds it against system pressure, while the 1/4 in male NPT pipe thread seats into any matching female NPT port in the air brake plumbing.

Because it is a DOT-approved air brake fitting and meets FMVSS 571.106 requirements for brake circuits, this is a part you can put into a service line and defend at an inspection instead of explaining. At a listed 0.1 lbs and 2 x 1 x 1 in on the shelf, it is worth keeping a couple in the truck box — the fitting costs nothing next to a night lost waiting on a parts run.

Sizing on push-to-connect fittings is unforgiving: the tube end and the pipe thread are two separate dimensions and both have to be right. Order by the Automann distributor number 177.13B688B when you need the 1/2 in tube to 1/4 in NPT combination specifically. It ships new and is backed by our 1-Year FleetPro Warranty.

Vehicle Fitment & Compatibility

This DOT brass air fitting uses a universal design intended for the following commercial applications:

• Make/Model: Universal — tractors and trailers with air brake systems
• System: Air brake plumbing / brake circuits
• Tube Size: 1/2 in push-to-connect tube end
• Port Thread: 1/4 in male NPT
• Standards: Meets FMVSS 571.106 / DOT requirements for brake circuits

Direct Replacement & Cross-Reference Numbers:

Order this Automann fitting by its distributor number:

• Automann Distributor #: 177.13B688B

Technical Specifications

• Component Type: Push-to-Connect (PLC) Male Connector, DOT Air Brake
• Tube End: 1/2 in
• Pipe Thread: 1/4 in NPT Male
• Body: Brass body and collet
• Compliance: FMVSS 571.106 / DOT
• Condition: New
• Warranty: 1-Year FleetPro Warranty
• Weight: 0.1 lbs
• Package Dims: 2 x 1 x 1 in
• Product Level: Fleet Standard Aftermarket
• Brand: Automann (Distributed by FleetPro Parts & Tires)