These replacement captive back plate thumbscrews will fit either the Moyer Marine flange or pedestal pumps. They are stainless steel, and include a lock washer. Thumbscrews are sold individually. Please note that while our thumbscrews can be used in Oberdorfer 201M and 202M series pumps, they will not retain their “captive” feature unless they are used with an MMI backplate. You can find our back plate kit here.