Hot Tub Compatible With Cal Spas Drain Valve PLU21400138Compatible With CAL SPAS Drain Valve Assembly 1 2" PLU21400138 OEM Drain Valve Assembly, 1 2" S Hose On Off. You Will Only Get One Item. Replacement drain valve assembly designed for CAL SPAS hot tubs. Features a 1 2" connection with on off hose control. This OEM compatible part (PLU21400138) provides reliable drainage functionality for routine maintenance and water changes. Single unit included. Ensure compatibility with your specific CAL SPAS model