One Way Valve 
 
These valves offer outstanding performance and allow water to flow in one direction and prevent back flow.
 
Models & Specs:
1. One Way Valve Nylon & Stainless Steel
A=M6-1.0          B=40mm
C=50mm          D=4mm
E=75mm           F=35mm
2. One Way Valve Stainless Steel
A=M6-1.0         B=40mm
C=50mm         D=4mm
  E=34mm        F=65mm