| Brand | Flextron |
| Type | Boiler Expansion Tank |
| Capacity | 2.1 gal |
| Compatible Model | Amtrol-15 |
| MPN | E-FTH15 |
| UPC | 804595405468 |
Flextron E-FTH15 2.1 Gallon Hydronic Expansion Tank For Heating Systems 1/2" NPT. Hydronic expansion tanks are diaphragm type tanks designed to keep system pressures below relief valve settings. Without hydronic expansion tanks, the system will quickly over-pressurize resulting in added stress to the various system components.