Valves: Holding Valves Store / Valves: Holding Valves The Holding Valve catgeory includes: Prince RD-1650 Pilot Operated (Single) Check Valves Sun Single Holding Check Valves Sun Double Holding Check Valves RD-1650 Pilot Operated Check Valve RD-1650 Pilot Operated Check Valve Single SUN Holding Valves Single SUN Holding Valves SUN Double Holding Valves SUN Double Holding Valves