Hot Tub Compatible With Marquis Spas Check Valve Swing 1/2" MRQ350-0515Upgrade your hot tub with the Hot Tub Compatible With Marquis Spas Check Valve Swing 1 2 Inch MRQ350 0515. This valve is compatible with Marquis Spas and has a 1 2 inch swing design for smooth water flow. Perfect for reducing the risk of water backflow, ensuring a safe and enjoyable spa experience. Hot Tub Compatible With Marquis Spas 1 2 Inch Swing Check Valve MRQ350 0515 You Will Receive One Item 1 2 Inch Swing Check Valve. White. 3 1 2 Inches Long.