The Water Worker G5L Expansion Tank is a diaphragm-type, pre-pressurized tank designed to protect residential hot water systems from the damaging effects of thermal expansion. Built with high-quality steel and NSF-certified components, this tank absorbs excess pressure caused by heated water, preventing relief valve discharge and extending the life of your water heater and plumbing fixtures.

Key Features:

• Capacity: 2 gallons
• Connection Size: 3/4" MNPT (Male National Pipe Thread)
• Material: Deep-drawn steel shell – twice as strong as rolled steel of the same thickness
• Diaphragm: Seamless butyl rubber – flexes without creasing for long-term reliability
• Liner: Polypropylene – resists flaking, cracking, and contamination; does not impart taste or odor to water
• Finish: High-gloss enamel – protects against corrosion and environmental wear
• Pre-Charge Pressure: Factory set to 25 psi (adjustable based on system requirements)
• Dimensions: Approx. 8" diameter x 13" height
• Weight: Approx. 5 lbs

Applications:

• Residential hot water systems
• Closed-loop plumbing systems
• In-floor heating systems
• Systems with backflow preventers or check valves

Compliance & Certifications:

• NSF Certified: Meets ANSI/NSF Standard 62 for potable water systems
• Lead-Free Construction: Safe for drinking water applications
• Required by Code: In many counties and states for water heater installations

Benefits:

• Protects Plumbing Fixtures: Prevents pressure-related damage to faucets, valves, and appliances
• Extends Water Heater Life: Reduces wear on the pressure relief valve
• Maintenance-Free: No servicing required once installed
• Compact Design: Fits easily in tight utility spaces
• Reliable Performance: Diaphragm and liner isolate water from metal shell for clean operation