BRASS ADAPTER 3/8 X 1/8

This brass adapter steps down a 3/8in NPT fitting to a 1/8in NPT connection. It's used on air, fuel, and lubrication lines on heavy-duty trucks and trailers where two different pipe-thread sizes need to mate. Brass construction resists corrosion and holds a reliable seal under vibration and pressure cycling.

United Truck Parts keeps this fitting in stock in Pennsylvania for fast shipping along the I-78 corridor, serving fleets, owner-operators, and repair shops nationwide. If you're unsure this is the exact fitting you need, reach out with your old part number or a photo and we'll help you match it — financing is available for bulk orders.