For outboard engines, a rugged see-thru bowl lets you visually monitor filter effectiveness. Inboard engine applications requireametal bowl. Accumulated water is easily drained from the collection bowl. When the filter element is replaced, the bowl is reused. The kit includes a new bowl which spins right onto the filter element. All MFG. numbers with "B" as the fourth letter are complete assemblies consisting of spin-on filter element and see-thru or metal bowl. 10 Micron - Replaces Mercury 35-60494-1 See thru bowl (Outboard only) 11/16"