I recently purchased a water pump housing kit for my 1975 115hp Merc. It came with the housing, impeller and all of the gaskets and o-rings. My question is: are there seals that goes in the top of the housing to seal around the drive shaft? I always assumed there was and in looking at an old metal housing I have there appears to be but, the new one I received does not have a seal. My Clymers repair manual talks about an upper seal but, I guess that could just be for the old original metal style. I just want to be sure before I put it back together. There is the rubber slinger seal that slides down the shaft and sits against the top of the housing but would that be it as far as any seals? Thanks for any help.