Clear View 4″ Screw-On Oil Filter Assembly BC400-115 with -12 Ports & 115 Micron Element, Clear Anodised
These 4” Screw-On Filters were designed to use a System 1 or disposable filter on the bottom. This is the same filter assembly as part # 400-115 except that filter has a receiver groove in the bottom which help prevents the disposable filter seal from blowing out. Part # 405-115 has a flat sealing surface on the bottom so a System 1 O-Ring seal can seal correctly. Early finned style and System 1 filters which use 2 O-Rings can only use the outside O-Ring to seal. The inside one cannot be used. Recommend using the Billet Pro Series System 1 which uses a single larger O-Ring seal. Also needs System 1 Chevy threaded bushing when using a System 1.
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