Description Description The Haskel 16578 is a spool valve made of aluminum that can control the flow of air in various applications. It has a 1/2 inch size and can withstand high pressures and temperatures. The Haskel 16578 is a durable and reliable valve that can be used in industries such as power generation, chemical processing, pulp and paper, and more. State of California Proposition 65 WARNINGCancer and Reproductive Harm - www.P65Warnings.ca.gov. Literature & Docs Accessories