MB series disc check valves, threaded connections.
Suitable for liquids, gases and steams. Applicable as a retainer, bottom and vacuum breaker (or breathe).

MB14 body in CW614N brass diameters from Ø1/2″. . . 2” rating PN 16/40
MB14/A body AISI 316L stainless steel diameters from Ø1/2” . . . 2” rating PN 16/40

The flow direction and location are indicated by an arrow on the body.