Flextrol FTH30 Pressurized Hydronic Non-Potable Expansion Tank for Closed Hot Water Heating Systems 4.8 Gallons， Boilers， Carbon Steel Shell 3/4 Inch MIP Connection， SBR Synthetic Rubber， Gray Color<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Hydronic Expansion Tanks Are Diaphragm Type Tanks Designed to Keep System Pressures Below Relief Valve Settings</li><li>Hydronic (Forced Hot Water) Expansion Tanks Absorb the Expansion of Water in Residential or Commercial Hydronic Heating and Cooling Systems</li><li>Low Profile Tank Design with Full Membrane Depth Eliminates Stretching of Diaphragm， Providing Increased Life Cycle</li><li>Hydronic Non-Potable Expansion Tank for Closed Hot Water Heating Systems， Boilers</li><li>MIG Welding Eliminates Interior Rough Spots and Sharp Edges; High Grade Steel Construction; Made In Italy; Certified Synthetic SBR Rubber Diaphragm</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41PTosIMKGL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31iameGHUXL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41wcCRSfpAL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41n2nyccXAL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41C18kUjn5L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31LAe3f7tgL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41E%2BnTlpyhL.jpg" noproxy>