Mueller 633-004 DZR Lead-Free Brass Push-Fit Cap, 3/4-Inch Forged dezincification-resistant brass construction - 316 stainless steel grip ring for strength and corrosion resistance Disconnect clip available for removal of fitting - Dual O-ring design (1-1/4" - 2") Integrated brass seal gland - Certified to NSF 61-G - Complies with ASSE 1061 IAPMO listed - AB1953 compliant - Full flow design - no tube liners Pex stiffeners included with each fitting (1/4" - 1") - "Lead-Free" Compliant