Kleinn Air Horns · New
Kleinn Hex Adapter - 3/8In F NPT to 1/2In M NPT
MPN 51238R · Store SKU kle51238R
Supplier stock checked 11/7/2026, 4:21:25 AM UTC. Adding a part does not reserve it.
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Product details
The Kleinn Model 51238R is a heavy-duty pneumatic hex adapter engineered to provide a secure, leak-free transition between different thread sizes within your high-pressure onboard air system. Featuring a premium, corrosion-resistant brass construction built to withstand demanding automotive environments, this universal component is designed with a 3/8" Female NPT threaded opening on one side and a 1/2" Male NPT threaded end on the other. This compact fitting allows you to easily adapt oversized tank ports or component lines, maximizing plumbing efficiency and ensuring a reliable air path for your air horns and heavy-duty onboard accessories. Hex reducer - 3/8" F NPT to 1/2" M NPT.
Manufacturer fitment & guides
Check 51238R against the manufacturer’s application information below.
Part-specific notes
- California Proposition 65: Y
