405-9659 Insulation, Door Level 2 used on the Cummins RS 20000 AA1 This will be item number

This will be item number 15 in the Hercules drawing

The old part number for this spring was 751-10312

Once completed the pump will be returned to you and you will do the reinstall

About the only difference is that the Hercules hose is about 1 inch longer in one area of the hose

Parts book describes it as "flywheel end to the center cylinders"

405-9659 Insulation, Door Level 2 used on the Cummins RS 20000 AA1 This will be item number405 9659 Enclosure Door Insulation, Sold in a set of 2. These are an aftermarket part and have nothing to do with Cummins Onan. Black covering over the sound insulation. This will be item number 20 in the Cummins drawing. There is a 3 day lead time on this item before it ships.