Flexcon Industries HTX15 FLEX2PRO Hydronic Expansion Tank - 2.1 Gallon<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Oversized 100% butyl diaphragm virtually eliminates diaphragm stretch， further promoting longevity</li><li>HTX tanks feature a brass air valve with rubber O-ring seal</li><li>Tanks are finished with appliance quality paint which helps prevent external corrosion</li><li>HTX tanks are comprehensively tested and backed by Flexcon’s 5 year limited warranty</li><li>Volume: 2.1 Gallons</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31616-STqAL.jpg" noproxy>