It is suitable for all sizes of one way valves,non return valves,check valves, oil supply valves, oil pumps, hand pumps and aluminum joints. It is suitable for all sizes of oil supply joints and hand pumps. Medium used: crude oil, gasoline, water, etc. (not suitable for methanol, because methanol produce formic acid when electrified, which corrode the interior of the product and lead to product failure) Scope of application: for , for , Vessel, Helicopters, Ships, Motorcycles and other fuel systems. Advantages: crude , gasoline and aging . Specifications: Specification: 6mm Opening pressure: 0.2 bar Working pressure range: 0.2-6 bar Working temperature range: -30 -130 colour: silver Material: aluminum alloy Package Contents: 2 x Check Valve Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.