Features Wear-resistant and Durable The one-way shut-off valve is made of PE material, which has sufficient pressure bearing capacity and rigidity, wear-resistant and durable. Strong Chemical Stability The check valve has good thermal performance, strong chemical stability, non-toxic and odorless. Wide Application The check valve is used for fish tank, food and beverage, medical equipment, chemical industry, etc. Good Performance This water stop check valve has good ozone resistance, high temperature resistance and corrosion resistance. 12 PIECES - This set includes 12 pieces of one-way check valve, which is used to connect the hose to prevent gas or liquid backflow. Specification: Item Type: One Way Check Valve Material: PE Function: Connect the hose to prevent gas or liquid backflow Scope of application: fish tanks, food and beverage, medical equipment, chemical industry Package List: 12 x One Way Check Valves Package List 12 x Single Way Check Valve