I had to replace 59896115 Grundfos but this model is no longer made. You can SIMPLY replace it with 59896155 WITHOUT any tools other than a 5/32 hex bit (6 sided). Simply loosen the four hex head screws securing the new electric pump to the water housing and do the same to the old existing pump. after turning off the water supply and replace them! Make sure the new O-ring stays in place on the new pump and check for leaks. Should take a maximum of 20 minutes. This pump is so quiet and delivers hot water instantly. The old Grundfos pump lasted 19 years, I hope this one is as good or even better.
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