The Waterway 413-1201 barb adapter is designed for compatible plumbing applications using a 3/8 inch barb connection and a 1/4 inch NPSM threaded outlet. Small transition fittings like this are useful where a tubing line must interface with a smaller threaded component in a controlled and compact way.This Waterway adapter is especially practical in feeder, support-line, and auxiliary plumbing applications where precision-fit small connections matter. Choosing the correct part helps avoid mismatched threads and supports a cleaner service outcome.For compatible small-line plumbing repairs and installations, this Waterway adapter is a practical solution when a 3/8 inch barb-to-1/4 inch NPSM transition is needed. Waterway barb adapter 3/8 inch barb x 1/4 inch NPSM connection Useful for small-line tubing-to-thread transitions Helps simplify compact plumbing interfaces Supports cleaner and more dependable service work