Brass Push-Lock Male Connector - 3/8" Tube x 1/4" NPT DOT Air Brake Fitting - Eaton 1868X6 Tectran PL13686B 177.13B686B
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Fitment
Fits these trucks
Universal - Class 8 tractors, commercial trailers and heavy-duty equipmentAir brake plumbing on tractors and trailers3/8 in nylon air brake tubing to a 1/4 in NPT male portDOT brake circuits - meets FMVSS 571.106
Always confirm your year, make & model before ordering.
Part numbers
OEM & interchange numbers
4 cross-refsEaton 1868X6 Sloan S68PMT-6-4 Tectran PL13686B Velvac 017944
Direct 1-to-1 replacement for every number above. Tap any number to copy.
Overview
Supply and reservoir lines run 3/8 in tubing for a reason - they have to move air fast enough to build pressure and release brakes without a delay. This Brass Push-Lock Connect (PLC) Male Connector from Automann takes that 3/8 in tube into a 1/4 in male NPT port, so the larger line can land on a standard quarter-inch valve or tank fitting. A fitting that seeps here costs you compressor duty cycle, wet tanks and a low-air warning on every cold morning. 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.
Full Airflow, Sealed Joint: The 3/8 in PLC Connector Advantage
The brass body and collet construction handles the part of the job most fittings fail at: staying sealed and staying serviceable. Brass resists the road salt and trapped condensate that corrode plated-steel fittings from the inside, and the threads still break free years later instead of shearing off in the port. The push-to-connect collet grips the tube's full circumference, so the joint holds without a ferrule or a crushed sleeve.
It is nylon tube compatible and DOT approved for heavy-duty air brake systems, meeting FMVSS 571.106 requirements for brake circuits, which is what separates a proper air-brake fitting from a pneumatic-shop lookalike. The connector weighs 0.08 lbs and ships in a 1.5 x 1 x 1 in package. Automann builds it to Fleet Standard specifications and backs it with a 1-Year FleetPro Warranty.
This fitting is a direct replacement for highly searched industry numbers including Eaton 1868X6, Sloan S68PMT-6-4, Tectran PL13686B and Velvac 017944. Cut the tube square and deburr it before assembly - a ragged cut is the usual reason a push-lock joint weeps.
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: 3/8 in nylon air brake tubing
- Port Thread: 1/4 in NPT male
- Compliance: Meets FMVSS 571.106 / DOT requirements for brake circuits
- 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: 1868X6
- Sloan Interchange: S68PMT-6-4
- Tectran Interchange: PL13686B
- Velvac Interchange: 017944
- Automann Distributor #: 177.13B686B
Technical Specifications
- Component Type: Push-Lock Connect (PLC) Male Connector, DOT air brake
- Tube End: 3/8 in
- Pipe Thread: 1/4 in NPT male
- Body: Brass body and collet
- Tube Compatibility: Nylon air brake tubing
- Compliance: DOT approved, FMVSS 571.106
- Condition: New
- Warranty: 1-Year FleetPro Warranty
- Weight: 0.08 lbs
- Package Dims: 1.5 x 1 x 1 in
- UPC: 889626032240
- Product Level: Fleet Standard Aftermarket
- Brand: Automann (Distributed by FleetPro Parts & Tires)
Key features
- Full 3/8 in Airflow: Keeps supply and reservoir lines at full 3/8 in tube size while landing on a standard 1/4 in NPT male port.
- Push-Lock, No Special Tool: The brass collet grips the full circumference of the nylon tube, so there is no ferrule to lose and no sleeve to crush.
- Brass Body and Collet: Resists the road salt and trapped condensate that rot plated-steel fittings, and the threads still break free years later.
- DOT Air Brake Approved: Meets FMVSS 571.106 requirements for brake circuits - a real air-brake fitting, not a pneumatic-shop lookalike.
- Wide Interchange: Direct replacement for Eaton 1868X6, Sloan S68PMT-6-4, Tectran PL13686B and Velvac 017944.
Specifications
Component Type
Push-Lock Connect (PLC) Male Connector, DOT air brake
Tube End
3/8 in
Pipe Thread
1/4 in NPT male
Body
Brass body and collet
Tube Compatibility
Nylon air brake tubing
Compliance
DOT approved, FMVSS 571.106
Condition
New
Warranty
1-Year FleetPro Warranty
Weight
0.08 lbs
Package Dims
1.5 x 1 x 1 in
UPC
889626032240
Product Level
Fleet Standard Aftermarket
Questions
Will this fit my truck?
This part fits Universal - Class 8 tractors, commercial trailers and heavy-duty equipment, Air brake plumbing on tractors and trailers, 3/8 in nylon air brake tubing to a 1/4 in NPT male port, DOT brake circuits - meets FMVSS 571.106. Always confirm your year, make and model before ordering.
What part numbers does it replace?
Yes. It is a direct replacement that interchanges with Eaton 1868X6, Sloan S68PMT-6-4, Tectran PL13686B, Velvac 017944.
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.