Watts 0067370 Expansion Tank

The Watts 0067370 PLT-5 Expansion Tank is a professional-grade solution engineered for potable water systems to manage thermal expansion. When water is heated in a closed system, it expands; this 2.1-gallon tank utilizes a rugged flexible butyl diaphragm and an FDA-approved polypropylene liner to absorb that excess volume. By stabilizing internal pressure, it prevents the frequent tripping of the T&P relief valve, protecting the integrity of residential water heaters and storage tanks. This model features 3/4 inch MNPT connections and a factory pre-charge of 20 psi, which is field-adjustable to match your specific site static pressure up to a maximum of 80 psi. Constructed with a drawn steel shell and a 1.48-gallon acceptance volume at standard pre-charge, it is rated for up to 150 psi and 200°F. The Watts 0067370 serves as the direct replacement for 0067437, 0067700, and PLT-5 models, ensuring seamless compatibility for maintenance and retrofit applications.

• Thermal Expansion Protection: Effectively absorbs expanded water volume to maintain balanced system pressure and protect plumbing components.
• High-Performance Bladder: Features a durable butyl diaphragm that separates air from water, preventing air loss and waterlogging.
• Lead-Free Reliability: Certified to ANSI/NSF 61 and IAPMO listed, ensuring safety and compliance in all potable water applications.
• Universal Compatibility: Designed for use with gas, oil, or electric direct-fired water heaters and hot water storage tanks.
• Robust Construction: Outer shell is made of high-strength drawn steel with a stainless steel-lined inlet for superior service life.

Is the pre-charge pressure adjustable?
Yes, the tank is field adjustable. While it comes factory-set at 20 psi, technicians should adjust the air charge to match the incoming city water pressure before installation while the tank is empty.

What does the 0067370 replace?
This unit is the direct replacement for 0067437 and 0067700, as well as older PLT-5 series tanks. The 3/4" MNPT connection ensures a drop-in fit for these legacy models.

Does this tank work with commercial water heaters?
It is primarily sized for residential potable water systems. For larger commercial storage tanks, verify that a 2.1-gallon total volume and 1.48-gallon acceptance volume meet the expansion requirements of the specific system.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.