Nailok Instrumentation Female Male Check Valve Non Return Design INLINE CHECK VALVES Trausch Dynamics China Custom In Line Check Valve Manufacturers, Suppliers Stainless Adjustable Female Check Valve Precision Flow Control Pneumatics Amazon.com: GASHER Brass Check Valve 3 4" Female to 3 4" Male. Vibrant Performance check valves are lightweight and constructed entirely from 6061 aluminum alloy. Vibrant Performance check valves are designed to prevent flow back of all varieties of fuel, oil or coolant and will stand up to the most rigorous operating environments. and are capable of handling temperatures ranging from 30deg F to 400deg F and operating pressures up to 300psi. All Vibrant Performance check valves are available in anodized black only