1/2 inch barb insert x 3/8 inch od compression, chrome plated brass, lead free, angle stop, 1/4 turn, oval handle, use with true value #608-933 cinch clamps, need cinch tool true value #608-743, or copper crimp rings on cross link polyethylene pex tubing, after crimping you can test each fitting to well over 100 psi, nsf listed brass inserts, 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 degree 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.