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Multifunction Valve: This inlet control multibloc valve group combines several control devices into one compact unit for unvented hot water systems. Pressure Regulation: The integrated 'droptight' pressure reducing valve maintains a pre-set water pressure of 3-6 bar. Expansion Relief: An expansion relief valve protects against excessive pressure build-up within the system. Temperature and Pressure Relief: A temperature and pressure relief valve provides an additional safety mechanism. Bundle Includes: 2 x Inlet Control Multibloc Valve Group 22mm and 1 x PRV Service Key for system drain down.