This guide shows you how to replace a top mounted Multiport Valve (MPV) on a Hayward sand filter. Some of the reasons for replacing a MPV are cracks in the valve's body or the top assembly, internal components failing like a spring or o-ring. Many of the internal components may be replaceable, but if your MPV is old, it might be time to replace the whole valve.
VIEW PLUMBING (IG POOL) - If you have an in-ground pool, your piping to the MPV will probably be rigid PVC. If you had unions installed, you can simply uncouple the unions to remove the fittings from the MPV ports. Without unions, you will have to cut into the piping to remove the fittings. This would be a good time to install unions for the next time you need to service the MPV.