Fully automatic twin pump designed for installation into vented systems to pump both the hot and cold water supplies, boosting both equally. Suitable for both positive and negative head applications. Does not require a gravity flow of water to start. Ideal for pressurising the supply in applications where outlets are higher than the water source, such as a loft conversion, or where it is uncertain if a positive flow of water exists. Must not be connected directly to mains water supply. Positive & Negative Head 15mm Anti-Vibration Couplers 1 Year Guarantee Up to 3 Connectable Showers Suitable for Gravity-Fed Systems Built-In 22mm Isolating Valve Continuous Rating Brass Positive & Negative Head 15mm Anti-Vibration Couplers 1 Year Guarantee Up to 3 Connectable Showers Suitable for Gravity-Fed Systems Built-In 22mm Isolating Valve Continuous Rating Brass