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Moyer Marine makes a replacement back plate for most Oberdorfer pumps on A4s that employs an o-ring and four captured knurled-head screws. The advantages are three-fold: No more having to replace the gasket, no more having to get a screw-driver on to the screws--possibly from an awkward angle/position, and no more dropping screws, etc. into the bilge
Perhaps the Speed Seal cover offers some of the same advantages?
Thanks for the picture of the new impeller, Hal!
Last edited by SEMIJim; 08-01-2008 at 08:15 AM.