The white CTS Twist and Lock fittings range now includes a 3/8-in. size for the union tee, elbow and coupler. The new size provides ease of installation and disconnection. The CTS range of fittings is suitable for hot- and cold-water plumbing and hydronic heating applications. They also are IAPMO- and NSF-approved for domestic plumbing in the U.S. and Canada.