Sioux Chief 672X1090, 1/2" PEX Manifold, 3/4" PEX inlet, spin clsd Go to amazon.com Related posts Check expert advices for pex manifold 3/4? Description3/4" crimp style PEX inlet. Outlet spin closed. (10) 1/2" PEX branches at 2" OC. 1" Copper pipe size manifold trunk.