Looks like a Groco to me as well.
You may have to put some effort into getting the top to move so make sure the filter and hoses are properly supported. Once you've got the top off you can check on the screen. If it's as bad as the unit looks, you may want to replace it. I'd also highly recommend cleaning the glass so you can get a good idea of filter clogging or water flow. If you've got some time you might consider cleaning it up some as well. And I'd plan on changing the gasket as well.
These are real workhorses - simple but effective design with a very long life. The screens aren't so durable as the case though.
Capt. Douglas Abbott
USCG/MCA IV/C.I./M.I. 500-ton Oceans
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