Watts 0342692 Valve

The Watts 0342692 (Model M335M2) is a heavy-duty 3/4" boiler pressure relief valve engineered for hydronic heating systems and low-pressure steam applications. Built with a rugged bronze body and a stainless steel spring, this valve is the direct replacement for Watts 0342671 and the legacy Watts 335 series. Designed to meet the stringent requirements of ASME Section IV, it provides critical overpressure protection for residential and light commercial boilers. The Watts M335M2-30 is factory-set at 30 PSI and features a high heat-resistant silicone disc to ensure a positive seal and reliable reseating after discharge.

For contractors upgrading older systems, this unit serves as the updated version for models 335-3/4-30 and M335-3/4-30. Its compact profile makes it an ideal fit for smaller OEM boiler cabinets where space is limited. With a high steam discharge capacity of 510,000 BTU/hr, the Watts 3/4 inch relief valve handles significant thermal expansion loads, preventing catastrophic pressure buildup. The MNPT x FNPT configuration (Male NPT inlet x Female NPT outlet) allows for direct installation into the boiler tapping with clear, unobstructed discharge piping to a safe floor drain.

• ASME Rated Performance: Certified to ASME Section IV standards for safety and reliability in hydronic and steam systems.
• High Heat Resilience: Equipped with a silicone disc and stainless steel spring for consistent operation up to 250°F.
• Direct Replacement Logic: Specifically designed to replace obsolete Watts 0342671 and 335 series components.
• Compact Bronze Construction: Robust all-bronze seat and body resist corrosion and fit tight OEM boiler clearances.
• High BTU Capacity: Rated for up to 510,000 BTU/hr, ensuring compatibility with a wide range of popular boiler sizes.

Is the Watts 0342692 compatible with both steam and hot water boilers?
Yes, the M335M2 is rated for use in low-pressure steam heating boilers and hot water heating systems that require a 30 PSI relief setting.

What is the difference between the 0342692 and the older 335 models?
The 0342692 is the current production model with modern materials, providing the same form and function as the discontinued Watts 335-3/4-30 and 0342671.

Does this valve have a male or female inlet?
This specific model features a 3/4" Male NPT inlet and a 3/4" Female NPT outlet. Always verify your boiler tapping orientation before installation.

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.