Brass Adapter, 1/4-18 Male NPT To 1/8-27 Male NPT, Straight Hex Nipple

For a simple size step-down, it’s a straight hex nipple with male NPTF threads on both ends, one side 1/4-18 and the other 1/8-27.

This adapter is often used in refrigeration systems, along with grease, instrumentation, and hydraulic setups.

Nothing is pre-applied to the threads on this one. It ships without any sealant, so you get to choose what works best for your setup, whether that's PTFE tape, a paste compound, or whatever you normally run. That actually makes it easier to match your existing system requirements, especially in instrumentation or refrigeration lines where certain sealants are preferred over others.