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I had bought a pussy pump with a crappy, not cushioned sucker but the pump was great. Simple mechanical on off switch 3 rechargeable batteries inside and a push button release valve.
So I removed the defect pumping heads, glued with silicone a suction cup on top of the 6cm diameter cylinder what has now a usable length of 26 cm. This setup works very well. I can disconnect the pump with the hose and the vacuum is still sealed in the cylinder.
Shown in the early development stage with just a flexible silicone tube the pussy pump cost around 16 Euros

Looking for some information in how to convert a aquarium pump Rena 600

I sent instructions for converting the Rena via PM.

I also sent info on converting the Bellema Mango to PumpPals.

medical grade evacuation pump with a water / moisture cup ac/dc operation look on ebay I have a portable unit and a stationary unit , good for wet pumping