Surge Alamo Drain Flapper Seal & exhaust pipe check valve - Item B

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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
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