After many requests from Four Winns, Carver, Cruisers Yachts, and Sea Ray owners that have boats with factory fitted disposable filters, we now offer a new filter. This latest offering is a reusable, direct replacement for the disposable Sealand Sanigard Part # 309310001 (5/8" fittings). The Big Orange OEM Replacement filter offers the same great features as the Big Orange "Original", a refillable cartridge and a filter bypass valve.