The Hayward ECX11194AT Filter Head W/New Vent Valve is a crucial component used to improve the functioning and performance of pool filtration systems. It is designed to replace or update the existing filter head assembly, which serves as a critical contact between the filter and the rest of the filtration system. It is equipped with a new vent valve, which allows for more efficient ai... https://www.usapoolshop.com/ecx11194at-hayward-filter-head-w-new-vent-valve