This item is highlighted as # 82 on the product illustration at the bottom right.

View a picture of the APS 41 diaphragm pump this item goes with by clicking the thumbnail on the left.

This desmopan diaphragm from Comet Pumps is part # 1800 0058 and is a replacement item that goes with the APS Series pumps including the APS 41 diaphragm pump.