Sioux Chief offers a full line of copper PEX manifolds for hydronic systems. Trunk connection options include 3/4" PEX, 3/4" and 1" female and male sweat, or spun closed. Branch connections include 3/8" and 1/2" PEX, ball valve, 1/2" MIP, 3/4" male and female sweat. Sioux Chief also offers custom manifolds and a wide range of PEX fittings, hangers and accessories for hydronic professionals. All Sioux Chief PEX fittings are compatible with SDR-9 PEX tube. Sioux Chief. Circle 5.