Air Pillow - 4' x 15' pool-shipping-estimates Durable heavy duty plastic core

Durable heavy duty plastic core is built to last

The outer section can swing up and locked with the included padlock so you can prevent unwanted pool access

Side mount pressure gauge with 1/4" threading

Large capacity holds up to 2lbs of 3" chlorine tablets or sticks

Air Pillow - 4' x 15' pool-shipping-estimates Durable heavy duty plastic coreAir Pillows are a winter closing essential for aboveground pools in colder climates. This rugged vinyl air pillow absorbs the pressure of freezing and thawing to protect the cover and walls of your pool. When your pool water freezes, the Air Pillow compresses to relieve pressure on your pool walls. And by elevating your winter pool cover, Air Pillows help keep it free of leaves, debris, rainwater and snow build up.