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Plumbing in the Home/Pumptrol - Water Pump Pressure Switch


Bob,  I live in a rural area and have dealt with wells and changing my own pumps and pressure switches for some time now.  The last time I changed the switch, I found a Square D Pumptrol 40-60 PSI that had a throw-out switch that would shut off the pump at low pressure.  This has saved the pump from burning up several times due to livestock breaking a line, etc.  Yesterday the points/contacts stuck and the heat caused the white plastic part that carries the points to be damaged. I looked al over town for the same switch but could not find one.  I did buy a similar switch without the throw-out built in.  Looking  at the part that was damaged I wonder if it would be possible to just change that part out and use the old switch body.  Looking at it further, there is a small spring at the bottom of the assembly that seems impossible to access.  I found an old switch in the pump shed and took it apart before I take the new one apart.  Is there a trick to re-assembling this into the switch body or should I just install the whole new switch until I find the one I want and change it out then?

Used to be you could buy a rebuild kit for the Square D switches.  I don't know if they are available these days or not.  They got to be so expensive that most people just bought a new switch.  Today, the Chinese knockoffs are as good or maybe even better than the Square D's.  Their quality has gone progressively down hill over the years.

I have the Merrill on my site for sale for $9.56 each.  They are the Chinese version but do the same thing.  Square D's are probably double or even triple that price.

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Bob Tabor


I am a Water Well Driller and Water Pump technician. I own a business in Riverview, Fl. We repair motors and pumps in shop and in the field. We repair and replace submersible and jet pumps, galvanized and bladder tanks, and their controls. Water filtration is another one of our specialties.


I started drilling and repairing wells and pumps with my dad in 1958 at the age of 13 years. I worked with him on weekends and in the summer when not in school. After graduating high school, I worked for my Dad until going into the Army in 1968. I spent three years in the Army then went back into the Well Drilling/Repair field.

Many Forums including my own.

High school and a few courses after getting out of the Army. They were offered on the GI Bill.

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