Brass Push-Lock Male Connector - 1/4" Tube x 1/4" NPT DOT Air Brake Fitting - Eaton 1868X4X4 Tectran PL13684B 177.13B684B

When a brake line has to jump from 1/4 in air-brake tubing to a 1/4 in male NPT port, this is the fitting that gets it done without a leak. The Brass Push-Lock Connect (PLC) Male Connector from Automann makes the joint tool-free and leak-tight: push the nylon tube into the brass collet and it locks. A tired or cracked fitting on this circuit means a slow drop in system pressure, a low-air buzzer that will not quit, and a truck that fails the next DOT inspection. 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.

Tool-Free and Leak-Tight: The 1/4 in PLC Connector Advantage

This connector pairs a 1/4 in tube end with a 1/4 in male NPT thread end - the most common combination on a tractor or trailer air system, where quarter-inch line feeds valves, tanks and control ports. The brass body and collet is the durable choice under a chassis: brass does not rust like plated steel, it stays workable after years of heat cycling, and the threads still break loose when the joint eventually has to come apart.

The push-lock principle keeps the repair honest. There is nothing to over-torque on the tube side and nothing to crush, so the line seals the same way every time whether it is being built on a lift or on a shoulder in the dark. It is DOT-approved for heavy-duty air brake systems and meets FMVSS 571.106, so it belongs in a service brake, parking brake or supply circuit - not just an accessory line. Automann builds it to Fleet Standard specifications.

This fitting is a direct replacement for highly searched industry numbers including Eaton 1868X4X4, Sloan S68PMT-4-4, Tectran PL13684B, Velvac 017941 and 68PMT44. Inspect the tubing for chafe and heat damage while the circuit is open.

Vehicle Fitment & Compatibility

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

• Make/Model: Universal - Class 8 tractors, commercial trailers and heavy-duty equipment
• System: Air brake plumbing on tractors and trailers
• Tube Size: 1/4 in air-brake tubing
• Port Thread: 1/4 in NPT male
• Compliance: DOT-approved for heavy-duty air brake systems, meets FMVSS 571.106
• Component Group: Air Brake & Wheel / Air System Manifolds & Valves

Direct Replacement & Cross-Reference Numbers:

This Automann brass fitting serves as a direct replacement for the following part numbers:

• Eaton Interchange: 1868X4X4
• Sloan Interchange: S68PMT-4-4
• Tectran Interchange: PL13684B
• Velvac Interchange: 017941
• Additional Interchange: 68PMT44
• Automann Distributor #: 177.13B684B

Technical Specifications

• Component Type: Push-Lock Connect (PLC) Male Connector, DOT air brake
• Tube End: 1/4 in
• Thread End: 1/4 in NPT male
• Body: Brass body and collet
• Application: Universal
• Compliance: DOT-approved, FMVSS 571.106
• Grade: Fleet Standard
• UPC: 889626032158
• Product Level: Fleet Standard Aftermarket
• Brand: Automann (Distributed by FleetPro Parts & Tires)