Eastman 3-Port F2159 PEX Closed Manifold – 3/4 In. x 1/2 In.The 3 port 3 4 inch x 1 2 inch closed PEX Manifold by Eastman is built of a high performance polymer plastic designed to connect PEX tubing. This fitting is an economical solution commonly used to put together tubing in hydronic systems and potable water supplies. This fitting may be used with stainless steel clamping systems or copper crimp rings. This fitting is UPC approved, NSF approved and complies with Lead Free law. Complies with ASTM F2159