Watts LFA736 Female Pipe Cap, 1/4-Inch FIP 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 Durable, lead-free brass is an excellent choice, with all tapered pipe threads manufactured to highest quality standards and tolerances This pipe fitting is easy to use for both contractors and the do-it-yourselfer Recommended for use with brass, copper, or iron pipe Not for underground use