Watts LFA18 Compression Female Adapter, 1/4-Inch C x 3/8-Inch FIP Low-lead brass compression female adapter 1/4-Inch by 3/8-Inch female Unique Ander-Lign compression fitting is the only fitting that is completely assembled with a captive sleeve The bodies are interchangeable with standard compression For use with copper, brass, aluminum, and plastic tubing Lead-free brass is not more than a weighted average of 0.25% lead when used with respect to the wetted surfaces of pipes and pipe and plumbing fittings and fixtures