Join Date: Jul 2000
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Re: What filter is this
Looks like a small flow in-line stainer ... probably connected to a raw water supply for cooling a refrig., a raw water supply for a RO unit, a raw water supply for a propshaft seal, or a small bilge pump strainer - especially for an old style diaphragm type bilge pump, etc. etc. etc. You twist off the top to get to the 'screen'.
With all that 'crud' in it, its probably serving a small bilge pump.