Home » Oil Heating Equipment » Anti Siphon Valves » Anti-Siphon Valve – Adjustable Anti-Siphon Valve – Adjustable Part Number: GS2060 KEY FEATURES:Connection Size – 3/8″ BSPAdjustable head – Between 0 – 4mtrs Head or 400mbDiaphragm – Nitrile Contact Us Shop Online 60+ years experience Expert Technical Advice