Response to what is its purpose. it just sits inside of the bottom tank at the top. seems to have nothing to do with the o-ring. it sits on the outer lip of the tank. the retaining ring is on the inside of the tank away from the o-ring. always wondered what it was supposed to do.

An image is worth 1,000 words! Add an image or two to your question to help ensure it is answered accurately.

Yes, please email me exclusive discounts, swimming pool tips and helpful how to guides. This comment may be posted on a public site. Do not include: HTML, references to other retailers, pricing, personal information, or any profane, inflammatory language.