4" NPT Horizontal Check Valve, Stainless Steel Non Return Swing Check Valve, Level One Way Counterflow Valve to Prevent the Medium Backflow for Oil Water Gas Air（4", DN100）

الوصف

4" NPT Horizontal Check Valve, Stainless Steel Non Return Swing Check Valve, Level One Way Counterflow Valve to Prevent the Medium Backflow for Oil Water Gas Air（4", DN100）