Item Type: Single Way Check Valve Material: PE Function: Connect the hose to prevent the backflow of gas or liquid Scope of Application: Fish tank, food and beverage, medicine equipment, chemical industry Package List 12 x Single Way Check Valve 112 Pcs: This set includes 12 pcs single way check valve, which is used to connect the hose to prevent the backflow of gas or liquid 2Good Performance: This water stop check valve has good ozone resistance, high temperature resistance and corrosion resistance 3Strong Chemical Stability: The check valve has good thermal performance, strong chemical stability, non toxic and odorless 4Wear Resistant and Durable: The one way stop valve is made of PE material, which has sufficient pressure bearing capacity and rigidity, wear resistant and durable 5Widely Application: The check valve is used for fish tank, food and beverage, medicine equipment, chemical industry, etc.