Parker non-return valves with an ISO 8434-2 (Triple-Lok®) or 8434-3 (O-Lok®) connection offer a wide range of sizes, male threads and cracking pressures, making them very flexible. The principle of a two-part non-return valve with an integrated soft sealing element has been proven by many applications in the market. This reliability is the reason for its successful use in applications with Triple-Lok® (37° flare) or O-Lok® (O-Ring face seal). Parker non-return valves are available with Cr(VI)-free surfaces. The broad product range goes from sizes 4 to 24 (6 mm to 38 mm O.D.)