These Kits are for the Vacuubrand MD12C dry diaphragm vacuum pumps and include the items needed to rebuild the diaphragm pump. This kit does not include the diaphragm pump motor bearings which are needed if the diaphragm pump is becoming increasingly noisy. For install see kit instructions enclosed. Please contact us for diaphragm pump rebuild service if diaphragm pump bearings are needed at (505) 872-0037.