5/32 in. x 1/8 in. Push-In x Male NPT DOT Adapter
5/32 in. x 1/8 in. Push-In x Male NPT DOT Adapter
Sizes in This Series
Brass DOT push-in to male NPT straight adapters. Jump to another size or add it straight to your cart:
| Size | Part # | Price | Cart |
| 5/32 in. x 1/8 in. (this page) | 685322 | $7.99 | — |
| 1/4 in. x 1/8 in. | 680402 | $4.51 | Add to cart |
Overview
The Midland 685322 is a forged brass D.O.T. adapter that mates 5/32 in. push-in tubing to a 1/8 in. male NPT port, sized for compact pneumatic and air brake control lines. The collet seats the tube in one push and holds it against vibration and pressure cycling. Built to FMVSS 571.106 and SAE J1131.
Technical Specifications
| Manufacturer Part # | 685322 |
| Tube Size (Push-In) | 5/32 in. |
| Thread Size | 1/8 in. Male NPT (1/8 - 27) |
| Connection Type | Push-to-Connect x Male NPT |
| Pressure Rating | 150 psi |
| Temperature Rating | -40°F to 200°F |
| DOT / SAE | FMVSS 571.106, SAE J1131 |
Materials of Construction
| Body | Brass |
| Collet / Grip Ring | Stainless steel gripper with O-ring seal |
Typical Applications
Connects small-bore 5/32 in. DOT tubing to 1/8 in. NPT ports on cab controls, gauges, and sensor lines across commercial vehicles and pneumatic equipment. A good fit where space is tight and a brass, high-temperature connection is required.
Cross-Reference and Interchange
This DOT push-in adapter cross-references to these competitor and industry part numbers: 1568-5/32-2, 268PC-5/32x2, 268PPDOT-2.5A, 68PM-5/32-2, AQ68-DOT-5/32X2, D7068DT-5/32A, PC1468-5/32A, PL-1368-25A, PP68AA-DOT, S68PMT-532-2. Replacing one of these? Match nominal size, connections, and rating, or send us your part number and we will confirm the interchange.
Sizing and Installation Resources
- Push-to-Connect Fittings Selection Guide
- NPT Thread Tightening: Turns Past Hand-Tight
- Pipe Size Reference Chart
- Teflon Tape vs. Pipe Dope
Frequently Asked Questions
What tube size does it accept?
5/32 in. OD DOT-rated tubing. Cut square and push fully in until it bottoms.
Is it DOT approved for air brakes?
Yes. It meets FMVSS 571.106 and SAE J1131, rated to 150 psi.
Does it need thread sealant?
A thin band of PTFE tape or pipe dope on the 1/8 in. male NPT threads is recommended.
Can the connection be reused?
Yes. Push the collet in and pull the tube out to release, then reconnect.
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.