Response to Hi Andy, yes, the O-ring, 6-1/4" ID, 1/4" (O-12) will fit your Strainer Cover - C3-185P.   Be sure to clean all of the sealing surfaces and apply some lubricant to help the new o-ring last a long time when you install it.    

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.