Marine Type Approvals held for these valves: American Bureau of Shipping, Bureau Veritas, DNV, Germanischer Lloyd, Lloyds Register. Overflow and control valves made of gunmetal with spring made of spring steel with anti-rust protection with threaded connections. With EPDM (ethylene propylene diene monomer rubber) seal suitable for water, neutral and non-sticking liquids, compressed air and neutral gases. Standard thread: BSPTm also available in female BSP-P for sizes up to 1” (PLEASE CLEARLY INDICATE IN THE ORDER:“f/f” or “BSPTm/BSPTm”). Valves can be delivered unset within a pressure range or set and sealed at the factory (against surcharge). Mesh sizes: G 1/2” to G 1-1/4” = 0.6 mm, DN40 and DN50 = 0.75 mm, Set pressure : 0.5 – 10 bar, Ranges of adjustment: 0.5 – 2 bar, 1.5 – 6 bar, 5.5 – 10 bar. Use: Suitable for water up to 95oC. Available seals : EPDM, FKM. Also available in Stainless Steel: series 430. Series 630 (Gunmetal):