Space-saving compact design that fits tight installations while providing effective adjustable pressure bypass for heating and cooling systems. Multi-purpose compatibility for underfloor heating, heat pumps, central heating, and air conditioning; a fundamental component in HVAC configurations. Stable water flow reduces hydraulic interference, promotes balanced circulation, improves overall system efficiency, and helps protect sensitive components. Easy pressure monitoring with a 360 degree viewing scale and dual unit measurement in bar and mH2O for quick and accurate readings. Use scenarios: - Residential radiant floor (underfloor heating) systems to balance flow and prevent pressure fluctuations. - Small to medium HVAC installations such as heat pumps or central heating where space is limited and monitoring is essential. - Retrofit or new builds in tight spaces, including air conditioning configurations, where compact bypass valves simplify installation and monitoring.