POOL WEIR REPLACEMENT COLLINS MK11 WEIR VACUUM LID GASKET ONLY Collins MK2 Vacuum Lid Gasket fits on vacuum lid and make sure the open spaces are sealed at the weir.The Collins MK2 Vac Lid Gasket is a sealing component designed to fit between the lid and the body of a swimming pool weir vacuum box or sump. It is made of a durable, flexible material such as rubber or silicone, and it is used to create a tight seal to prevent water from leaking out of the vacuum box or sump. It is typically used in swimming pools or spas as part of the skimming system. The gasket is easy to install and maintain, it is a simple replacement part that will ensure the proper functioning of the vacuum box or sump and prevent water leaks, also works for Collins MK2 vacuum lid. It can infect the pool cleaner's performance. The Collins MK2 Weir vac lid is an old-style weir basket used in South African pools .