These Adixen Alcatel Drytel 30 and Drytel 31 dry diaphragm vacuum pump gasket rebuilt kit include the items need to rebuild the diaphragm pumps in most Drytel 30 and Drytel 31 systems. These kits include the rubber diaphragms and hardware need to replace the diaphragms and head gaskets. This kit does not include the diaphragm pump motor bearings which are needed if the diaphragm pump is becoming increasingly noisy. Please contact us for diaphragm pump rebuild service if diaphragm pump bearings are needed.