Are cheap smoke machine pumps serviceable?

Having taken the cheap smoke machine apart, I wondered how serviceable the little solenoid pump was.

It turns out that it's a very standard design with equally standard sizes. This means that it has good serviceability if needed.

By far the most common problems I see in these pumps are failure of the little O-ring that seals the moving plunger, and breaking of the spring or valve inside the plunger itself.
The O-ring is usually a standard size - 4mm internal diameter, 1mm core diameter and 6mm outside diameter (often described as 6*1).
If the internal valve breaks it's new-pump time. But if it's the spring that breaks where it's attached to the valve then you can sometimes fold up the last turn of the spring to make a new hook for the valve.

These pumps are fairly cheap online. Typically about £10.

If you need to change the o-ring in your pump then they are sold as part of some small kits on AliExpress. They refer to this size as 6*1 or 6mm outer diameter by 1mm rubber diameter.
Here's a handy affiliate link to spare kits. The smaller kit has the 6*1 size:-
https://s.click.aliexpress.com/e/_c4eSH0N7




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