4pcs 1/2 inch Check Valve Wear Resistant One Way Check Valves for Fuel Gas Air Plastic Water Stops Check Valves

Features:
– Perfect for the hydraulic system to prevent reflux flow of material, or compressed air for pneumatic system to prevent.
– Made of polyvinyl chloride material, safe, can be used for a long time.
– Normal performance under -30 degrees celsius to 150 degrees celsius, outstanding ozone, UV and weather resistance.
– Flow smoothly, small fluid resistance, good sealing performance, short spool stroke, small off valve impact force, attractive appearance and high reliability.