JIS F 7409 16K SCS16 Immaculata Steel Screw Down Check Globe Valvesmarine Screw Down Globum Valvae Valvae etiam vocatur ut valvae marinae SDNR, valvae marinae sistenda valvae, globus marinus non reuturnus valvae, globus marinus valvae reprimuntur..etc.Function: aperta/claudo fistulae systematis et ne medium flowback.Design Standard: JIS F7409-1996