Non-return valve for stopping water backflow when siphoning.Features:• Stainless spring - No corrosion or risk of internal valve staying open.• Very low opening pressure with minimal restriction on flow-rate.• Minimal installation room needed and no other fittings required.• The White Arrow identifies water flow direction.• Recommended operating pressure: 0 - 150 psi (Max 230 psi).• Recommended operating temperature: 65°C (Max 93°C).• Glass reinforced nylon composite - High strength, stiffness and light weight.• Immune to corrosion and electrolysis for long service life.• Chemical resistant - Impervious to diesel, petrol and antifouling paints.• UV resistant, suitable for all marine environments.