Response to David, The 1-1/2" Top Mt. Clamp Style Valve (261186) will work on the AT3123 model not sure if it work on the AT3123B model. Is there any part numbers on the valve that you have?

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.