Response to Byron, This valve will fit the S166T. It sounds like you may need to inspect the spring. The spring can be difficult to replace so you may be better off replacing the entire valve. 

An image is worth 1,000 words! Add an image or two to your comment to help ensure it is understood 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.