Description B. Rubber drain Valve for Alamo vacuum tanks and exhaust flapper for alamo pumps. Also prevents alamo pumps from spinning backwards at shut down Item no. 15 in detail image line drawing Mounts on A in picture (See below) about 2 5/8 outside diameter Double check size as there are other version that look similar but different size Babson 20440 Surge Alamo Original Parts by GEA Farm Technologies Inc Related Items; 7750-0020-440 Rubber flapper drain for alamo vacuum and exhaust 7750-0014-889 Stainless Steel Support Assembly for 20440 drain flapper 7/26
