You are purchasing an OEM Meyer Guide Bushing/Sleeve (Part#15199) that sits in the cap on the E-46, E-47, E-57, E-58, E-88, E-78, V-66, V-68 and E-60 Meyer Snow Plow Pumps. It does not come in the Basic Seal Kit, or even the Master Seal Kit.They are often found to be damaged once you have the cap off your pump. The O Ring Seal mates against this to make a tight seal and keep out water! If this is not smooth on the top and bottom edges, or if it gets worn, it must be replaced. Keep a spare on hand! Download the E-47, E-57, and E-60 as well as ALL Meyer Service Manuals and Owners Manuals off the Meyer web site for FREE to assist with installation.