Here is a Busch Original filter kit for your Busch RA0155 vacuum pumps.     If you were to order this from the manufacturer, you would use part number 0992.564.014

This kit consists of  exhaust filters,  oil filter, O-rings, and gaskets. 

Filter changes are recommended at least once a year.  If your pump is smoking out of the exhaust end, changing the filters often clears up the problem.   

Check out our other auctions for repair kits for these model pumps  Contact me with any questions.  Thanks for looking.