This is a replacement drain plug for early E-47 units. Early E-47 units have two of these (sometimes 3) on the front. They remove with a 5/8" wrench or socket. IT WILL NOT FIT ANY OTHER UNITS. Click on Related Items for newer E-47 Drain plugs that also fit ALL other Meyer plow pumps. These are just plugs, the Filters no longer come attached to them. You need to buy Filters too. Click on Related Items.