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Multi-Function Design: This one-piece valve incorporates a pressure reducing valve, check valve, and isolating valves for controlling the incoming water supply to an unvented hot water cylinder. Precise Pressure Control: The 'droptight' pressure reducing valve ensures the pre-set pressure of 3/4.5 Bar is consistently maintained. Easy Installation: Compact design with 22mm connections allows for convenient installation in tight spaces. Included Accessories: Bundle includes a PRV service key for system drain down and maintenance. Durable Construction: Crafted from high-quality brass for long-lasting performance and reliability., Manufacturer: Unvented Components