3/4" x 1/2", lead free brass barb insert coupling, for connecting 3/4" & 1/2" pieces of cross link polyethylene pex tubing, secure 3/4" barb end of fitting to 3/4" pex pipe with tv #608-826 cinch clamps & tv #608-743 cinch tool & 1/2" barb end of fitting to 1/2" pex pipe with tv #608-933 cinch clamps & tv #608-743 cinch tool, or copper crimp rings & crimp tool, immediately testable to well over 100 psi, meets the new nsf/ansi standard 14-2009 & astm f 1807-9si standard for products intended for the transport of potable water, ansi/nsf standard 61 annex g for lead free compliance & the wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight to meet ab1953 California & vt s152 Vermont low lead restrictions.