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4.5 Gal. Thermal Expansion Tank

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Product Overview

EasyFlex Tankone is designed to maintain safe pressures in a domestic water heating system that utilizes a backflow preventer or check valve. Tankone features a butyl rubber diaphragm and plastic liner to separate the system water from the tank's air charge. The system connection has a stainless steel nipple to prevent corrosion. High quality coating on the shell will help to prevent external corrosion. Every Tankone tank is comprehensively tested and backed by an Easyflex 5 year limited warranty.
  • Stainless steel 3/4 in. MIP with Hex
  • Butyl rubber diaphragm, lined with polypropylene
  • Factory pre-charged at 40 psig
  • Air charging port: brass port with O-ring seal
  • Protects water heater, fixtures and appliances
  • Prevents dangerous pressure build up
  • Stainless steel connector with HEX
  • Provides a reservoir for expanded water volume
  • Finish: high quality coating prevents corrosion
  • cUPC certified
  • NSF 61 and 372 compliant
  • California residents

Info & Guides

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Product Depth (in.)
11 in
Product Height (in.)
15 in
Product Width (in.)
11 in


Compatible Brand/Model
Finish Family
16 gauge cold rolled steel
Pack Size
Product Weight (lb.)
8.7 lb

Warranty / Certifications

Manufacturer Warranty
5 Year Limited Warranty

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