Flexcon PH 12 Expansion Tank – 4.5 Gal

Premium Protection for Your Hydronic System

The Flexcon PH 12 Expansion Tank delivers unmatched durability with a 100% butyl diaphragm and plastic liner, ensuring complete separation between system water and precharged air. Unlike other brands, this tank features a stainless steel sleeve for corrosion resistance—both internally and externally—thanks to appliance-grade paint. Designed for long-term reliability, it’s rigorously tested and backed by Flexcon’s 1-year limited warranty.

Ideal for residential and light commercial applications, this 4.8-gallon expansion tank helps maintain system pressure while protecting against corrosion, leaks, and premature failure. The stainless steel connection nipple ensures a secure, long-lasting fit, making it a trusted choice for plumbers and DIYers alike.