I believe West Marine has a rebuild kit for this. There are two listed on west marine. Model 400 and 500. 400 is for the 1" ports and 500 is the 1.5" ports. Here are the part numbers for the rebuild kits for each:

model 400 - 142737 model 500 - 142745

Hope that helps.

-Jason

:: The bilge pump on #111 has a bad valve and won't develop
:: any suction. I would like to replace it or rebuild but
:: can't seem to find the exact replacement. The pump
:: itself says it's a Guzzler but I can't seem to find any
:: model # on it. Googled it and didn't find anything that
:: looked like it would mount in the current location with
:: the same handle cut out. Any help would be much
:: appreciated. Thanks