Specification:
inner diameter:9.4cm/3.68 inch
outer diameter:10.5cm/4.12 inch
thickness: 0.6cm/0.22 inch

Compatible Models:
R172009 o-ring replacement for pentair model 300/320
for Rainbow Chlorinator 300 & 320 lid, for Model 300, 302, 300-19, 300-29, for Model 300-29X, for Model 320, 322

Installation:
1. Unscrew the top white cap
2. Remove cracked O-ring and replace with a new one
3. You can properly apply some smoothing agent to make it easier to put in
4. Finally, tighten the cap to make sure it's not loose

Function:
In the filter, the sealing ring is an important part connecting the filter head and the cartridge, which plays the role of sealing and fixing the cartridge
It can seal the gap between the filter head and the cartridge to prevent impurities from entering the cartridge through the gap, and can effectively prevent moisture, dust, sand and other particles from entering the inside of the filter to keep the cartridge clean, thus prolonging its service life

Warm Note:
To maintain the performance of your pump and filter, we advise you to change your o-rings every 3-4 months, depending on the environment, temperature and pH of your water

Package Includes:
6x O-Ring