John Guest introduces its new Reducing Coupler in ½-inch x 3/8-inch CTS size for use in the domestic plumbing market. Manufactured from high quality engineered plastic with an EPDM O-ring, the coupler satisfies both hot and cold water plumbing/remodeling and hydronic heating applications. Suitable for use with any combination of copper, PEX, or CPVC pipe, this fitting doesn't require tools to make a leak-proof connection. The coupler also incorporates JG's Twist and Lock technology providing users with extra security. Both lead-free and corrosion-free, this product is NSF and IAPMO approved for domestic plumbing in the U.S. and Canada.