You are buying a single drain plug that fits Meyer E-46, E-47, E-57, E-58, E-60, V-66, V-68, E-78, and E-88 Snow Plow Pumps. It has an O Ring on it. Additional O Rings and Seal Kits are available here in our store. We stock every seal for all Meyer Pumps listed above. This Drain Plug has an 11/16" Hex Head on it. It will NOT FIT older E-47 units with 5/8" Hex Head drain plugs. They are here in our store too, click on the Related Items tab.