Heatlink USA offers the TwistSeal(TM) manifold in a 22 gpm high capacity model for commercial construction and snowmelting, and the TwistSeal Mini, an 11 gpm version for residential and light commercial construction. Features include patented technology, modular design, plastic construction, full flow with 1" union, 1" female IPS, 1 1/2" male IPS supply end connections, supply shut-offs, individual loop flow balancing and automatic control capability, and interchangeable brass compression or polysulfone pipe to manifold fittings (3/8", 1/2", 5/8", 3/4"). Heatlink USA, Inc. Circle 10.