The Pentair 59016200 Air Bleed Sock Kit is a critical component for improving the operation of pool and spa filtration systems. Its main purpose as an is to release trapped air from the filter system, resulting in the best possible water flow and filtration effectiveness. This small yet functional kit, measuring 1-1/2" in length, 1/4" in height, and 1" in width, is designed to fit nea... https://www.usapoolshop.com/59016200-pentair-air-bleed-sock-kit