- Fits AWWA C606
+ Working pressure: 25 bar / 365PSI
+ Temperature: 0oC to 80oC
+ Bonded epoxy coating compound RAL3000
+ Grooved ends to accommodate ANSl/AWWA and BS . pipe sizes Description The GSC-365-R is a vertically installed non-return valve in a Riser Rv arrangement. With the cut-off unit, check the valve using a current switch and alarm instead of a water engine gong to announce fire. The valve body is the same as the GSC-365-I, easily adaptable across the field of work.