G-5 Water Heater Expansion Tank, 2 Gallon

A Water Worker G-5 expansion tank is a safety device designed to protect residential water heating systems from dangerous pressure spikes and water overflow. When water heats, it expands—especially in closed plumbing systems where there is nowhere for that extra volume to go. Without an expansion tank, this pressure buildup can damage your water heater, pipes, and fixtures, or cause costly leaks. This 2-gallon tank absorbs that expanded water temporarily, keeping pressure levels safe and extending the life of your entire hot water system.

The Water Worker G-5 is engineered for standard residential setups, fitting water heaters up to 80 gallons. It comes factory-precharged at 40 psi and features a heavy-duty butyl diaphragm that flexes to accommodate water expansion while maintaining a leak-proof air chamber. The steel outer shell with polypropylene lining resists corrosion. The 3/4" male pipe thread connection works with existing plumbing lines. Manufactured in the USA, this tank is UL-listed, IAPMO and NSF compliant, and backed by a 5-year warranty.

Features and Benefits

• Pressure Spike Protection: The precharged diaphragm absorbs expanded water and reduces harmful pressure buildup in closed water systems, protecting your water heater and appliances.
• 2-Gallon Capacity: Optimal size for typical residential water heaters up to 80 gallons, delivering effective expansion control.
• Durable Construction: Steel body with polypropylene interior lining provides long-term corrosion resistance and reliable performance.
• High Temperature Rated: Rated to 200°F with a maximum working pressure of 150 psi, safe for hot water systems without compromise.
• Code-Compliant and Safe: UL-listed, IAPMO and NSF certified for potable water use; satisfies plumbing code requirements.
• Backed by Warranty: Limited 5-year warranty and USA manufacturing ensure quality and peace of mind.

Specifications

• Brand: Water Worker
• Model: G-5W (also listed as 155339)
• Capacity: 2 gallons
• Dimensions: 8" × 8" × 13"
• Weight: 5 lbs
• Connection Size: 3/4" MPT
• Material: Steel shell with polypropylene lining and butyl diaphragm
• Color: White
• Maximum Temperature: 200°F
• Maximum Working Pressure: 150 psi
• Factory Precharge: 40 psi
• Certifications: UL-listed, IAPMO and NSF compliant
• Application: Residential; fits water heaters up to 80 gallons
• Warranty: Limited 5-year warranty
• Origin: Manufactured in the USA