Watts LFA55 Compression to Female Flare Adapter, 1/4-Inch OD x 1/4-Inch Fem Flare Durable, lead-free brass is an excellent choice, with all threads manufactured to highest quality standards and tolerances This compression fitting is easy to use for both contractors and the do-it-yourselfer 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 Not for underground use