Description Description The Haskel 28752 is an upper air cap that fits on the Haskel air-driven liquid pumps. The upper air cap is made of durable metal and has a threaded design for easy installation and removal. The upper air cap protects the air piston and the air valve from dust and debris, and ensures optimal performance of the pump. The Haskel 28752 upper air cap is compatible with various models of Haskel pumps, such as the AW series, the AAD series, and the AGD series. State of California Proposition 65 WARNINGCancer and Reproductive Harm - www.P65Warnings.ca.gov. Literature & Docs Accessories