Response to I called Pentair Technical Assistance ( 800-831-7133 ) and asked them. They said for a filter that is older than 2001, the part number I was given is Pentair 154856 - which is our part number 4600-4856.

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.