Raritan Pressure Relief Valve - 75 PSI. Raritan manufactures equipment for pleasure boats throughout the world. Products include marine toilets waste treatment systems icemakers and water heaters. Committed to the environment and preserving sea life Raritan designs products to help maintain an environmental balance and ensure the quality of marine waters. Specifications for Raritan Pressure Relief Valve: Manufacturer: Raritan Color: Black Package Contents: Raritan Pressure Relief Valve Raritan WH3: Pressure Relief Valve - 75 PSI