JIS F 7409 16K SCS16 Stainless Steel Screw Down Check Globe ValvesMarine Screw Down Check Globe Valve ay tinatawag ding marine SDNR Valve, marine stop check valve, marine globe non reuturn valve, marine globe check valve..etc.Function: open/close the pipe system at pigilan ang medium flowback.Pamantayang Disenyo: JIS F7409-1996