Sealand B-Series pump Diaphragm. 
Note  4 holes in the diaphragm center

SeaLand / Dometic 340734 B Series Pump Diaphragm

Sealand
$150.00 $135.00 (You save $15.00)
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SKU 340734
Weight 1.00 LBS
Height 8.00
Width 8.00
Depth 4.00
Availability In Stock

SeaLand / Dometic pump diaphragm for B Series Vacuum Pump.