Watts LFA10 Compression Union 1/4-Inch Low-lead brass compression union 1-pack 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