624-21560 Seal, rear main. DWS Lister Petter engine. Part number 34407-11090 is also associated with this gasket624 21560 Rear main seal, used in the DWS Lister Petter engines. Part number 34407 11090 is also associated with this part, under a different brand name and model number, but same OEM gasket. This is a 2 part seal kit. Same seal for the turbo and Non turbo engines. The DWS model engine was also used in the SDMO T25C2M, T30U, and the TM30 line of generators, and in the Armstrong LP30 generators, this engine was also used in Caterpiller equipment from