DONGKER CO2 Check Valve,6mm Aquarium Way Valves Stainless Steel Anti Backflow Non Return for Fish Tank Air Pump

【Material】Made of Stainless Steel, Fine Workmanship, Strong and sturdy 【Non-return Design】Prevent Gas or Liquid Backflow When Pressure Changes, Prevent CO2 Equipment Damage 【Adaptable】Good Airtightness, No Leakage, Two-way Quick Plug and No Leakage, Trachea and Trachea Connected Or Trachea and Thinner 【Use】Suitable for Trachea With Inner Diameter 4mm and Outer Diameter 6mm, Only for CO2 Refiner (not Applicable For Air Refiner) SHOP WITH CONFIDENCE: To Provide You With the Highest Quality Service, If You Have Any Question, Please Contact Us.We Will Provide After-sales Service Until You Are Satisfied.