Depending on model:

Four-corner bolthole pattern on outside of base provides extra stability

Makes fuel transfer safe and easy

Outlet 3/4 in-16 straight thread O-ring Boss

554 010 DF100 Aluminum-Acetal Check Balls

Beckett Fuel Oil Filter Replacement Cartridges Carrying handle Depending on model:Manufactured exclusively for our Firomatic Filters. Engineered and manufactured for a tight seal within our C40 and C50 filter cans to insure positive filtration through the cartridge, not around it. Ribbed design offers more surface area for reliable filtration and performance. 10 day handling time ships direct from manufacturer