Eaton Weatherhead 9255X6X4 Carbon Steel Fitting, Swivel, Adapter, 3/8" NPSM Female x 1/4" NPT Female (Pack of 4) Swivel fitting adapter for joining two pipes in a range of hydraulic fluid transfer applications 1/4" female NPT threads on one end and 3/8" female NPSM threads on the other for connecting pipes with differently threaded ends Zinc-plated steel for strength, durability, and resistance to corrosion Meets SAE 140131 specifications for pipe fittings