SharkBite 3/8″ Brass Lead-Free Barb Pex End Plug. For use with Pex tubing & connected with stainless steel cinch clamps & cinch tool TV# 608743. ASTM F-876, ASTM F-877 to SDR-9 dimensional standards. NSF 14 & 61 for use in potable water systems. CSA B137.5 standards. NSF CL-R certified for use in hot water systems where chlorinated 140 degrees Fahrenheit hot water can be constantly re-circulated. The wetted surface of this product contacted by consumable water contains less than 1/4 of 1 percent, 0.25%, of lead by weight. Meets AB1953 California & VT S152 Vermont low lead restrictions.