Description
When you’re running pneumatic controls on your tractor or implementing air-powered equipment, having the right fittings makes all the difference between a job that runs smooth and one that gives you headaches. This stem adapter connects standard 3/8 inch pneumatic tubing to 1/4 inch NPTF threaded ports, giving you the flexibility to hook up gauges, valves, and other pneumatic components without hunting for hard-to-find specialty fittings.
What You’re Getting
- Direct connection from 3/8 inch tube to 1/4 inch NPTF thread without adapters or reducers
- Push-connect design that grips tubing securely while still allowing easy removal when needed
- High-quality construction that handles farm air pressures without leaking or failing
- Compact size that fits in tight spaces where larger fittings won’t work
Built for Real Farm Work
These adapters are handy when you’re setting up air brakes on trailers, connecting pneumatic seeders, or adding air gauges to monitor tire pressure systems. They’re also useful for custom pneumatic setups like air-powered chute controls on grain handling equipment or pneumatic cylinders on implement lift systems.
Made to Last
John Guest fittings are built to handle the vibration, temperature swings, and general abuse that comes with agricultural work. The materials resist corrosion and UV damage, so they’ll keep working whether they’re mounted in the cab or exposed to the elements.
Installation Notes
Push the tubing in firmly until it bottoms out in the fitting—you’ll feel it seat properly. Use thread sealant on the NPTF connection to prevent air leaks. If you need to remove the tubing later, press the collet ring while pulling on the tube.


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