Pool Diverter Valves are generally installed in tight groups to save space in the pool equipment area. When one of these valves has to be replaced, there generally isn't enough flexibility in the pipes to cut out and squeeze in a standard diverter valve because of the 3/4" overlap required on each end of the valve. By using a Diverter Valve with unions, however, you can install the unions and drop in the valve between the unions without having to spread the pipes. Also, if you ever have to replace this valve again, you won't have to cut it out again, just loosen the unions, pull out the damaged valve and drop in a new one between the existing unions. This guide shows you how to replace a standard 3-way direrter valve with a Valve with unions.