75gasgas

Hi there,

2005 S500 4matic.

Having the typical problems with the PSE pump. Disassembled the pump to replace the broken impeller and burned out motor however, can not locate the small black rubber piece on the positive pressure side. I think it is the check valve?

My question is, Anyone know what material it is made from? or, another source for that part??

Considering just ordering a pump off eBay to source the small part.

Thanks in advance!!!