Check for Valve Stainless Steel Non-Return Anti-Backflow Valves for Aquarium Co2 System Ensuring One Direction Water Flo

High-concerned chemical：None Structure：Check Valve Port Size：4mm Media：aquarium &co2 Material：Stainless steel Temperature of Media：Normal Temperature Standard or Nonstandard：Standard Pressure：Low Pressure Is Smart Device：no Origin：Mainland China Certification：NONE Size(L*for W)：:40mm * 4mm(approx) Material:：Stainless steel

High-concerned chemical: None Structure: Check Valve Port Size: 4mm Media: aquarium &co2 Material: Stainless steel Temperature of Media: Normal Temperature Standard or Nonstandard: Standard Pressure: Low Pressure Is Smart Device: no Origin: Mainland China Certification: NONE Size(L*for W): :40mm * 4mm(approx) Material:: Stainless steel