Whale Temperature & Pressure Relief Valve

The Whale Temperature & Pressure Relief Valve (Part No. 75974) is a 1/2" NPT marine hot water system safety component designed to protect pressurized water heaters aboard vessels. This relief valve serves as a critical safety mechanism on 6 and 11-gallon marine water heaters, preventing dangerous pressure and temperature buildup that could lead to system failure or personal injury. The valve's 100 PSI maximum rating is calibrated to match the typical operating parameters of modern marine water heating systems found on cruising sailboats, cabin cruisers, and offshore fishing vessels.

Built by Whale Marine, a respected manufacturer of marine plumbing and water system components, this relief valve combines dual-function temperature and pressure protection in a compact design. The 1/2" NPT (National Pipe Thread) connection integrates directly into standard marine hot water heater installations without adapter fittings. At just 0.05 lbs and measuring 3 x 1 x 8 inches, the valve occupies minimal space in cramped engine compartments or galley installations where marine system real estate is limited. The NPT threaded connection ensures secure, leak-free installation—a critical requirement in marine environments where vibration, saltwater corrosion, and constant motion demand absolute reliability.

This valve is essential for any boater or marine technician maintaining pressurized hot water systems. Weekend anglers with cabin cruisers and serious offshore operators alike depend on functioning relief valves to prevent catastrophic water heater ruptures during extended cruises. Whether you're replacing a failed valve, upgrading aging plumbing infrastructure, or commissioning a newly installed water system, this Whale component ensures your vessel's hot water system operates within safe parameters. Proper relief valve function protects not only equipment investment but also crew safety aboard.