You must also replace the Kombi Valve at same time as this pump.
This is a new, original Pierburg pump, identical to those sold at a VW dealer for more than twice the price. It is NOT one of the cheap, poor quality Chinese imitation pumps found on eBay and other sites.
Eurovan 1997-2000 Rialta 1997-2000
Failure of the Secondary Air Pump is generally caused by a failed Kombi valve. The failure of this check valve allows hot exhaust gases to travel back into the pump. The water vapor in the exhaust gasses will condense and quickly corrode the pump internals. Replace this valve when replacing the pump. Failure to do so will void the warranty on the air pump