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Compensator Diaphragm P40 1800.0001 #37
$9.50
Compensator Diaphragm P40 1800.0001 #37. A genuine service component for the Comet P-40 diaphragm pump, part number 1800.0001, position #37 in the parts diagram.
The Comet P-40 is the most widely used diaphragm pump in professional softwash and roof cleaning, and its parts availability is a large part of why. These pumps handle sodium hypochlorite continuously, which is punishing on diaphragms, valves, and seals — the ability to rebuild rather than replace is what makes them economical to run at scale.
Chemical exposure is what drives most P-40 wear. Diaphragms harden and crack, valves foul and stop sealing, and O-rings degrade. Flushing the pump with fresh water after every chemical use extends the life of every one of these components substantially, and it costs nothing but a few minutes.
Match the part number and diagram position exactly. The P-40 has gone through design revisions, and old-style and new-style components are not always interchangeable. Confirm against your pump before ordering.
Frequently Asked Questions
What pump does this fit? The Comet P-40 diaphragm pump — part 1800.0001, #37 in the diagram.
Why do P-40 parts wear out? Continuous sodium hypochlorite exposure hardens diaphragms, fouls valves, and degrades seals. It's the nature of softwash work.
How can I extend service life? Flush the pump with fresh water after every chemical use. It costs a few minutes and meaningfully extends diaphragm and valve life.
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