Alternitive high pressure pump for low depths in rc

[subnewbie123]

Hi all,
I am currently part of a small team testing possible designs of buoyancy engines.It’s a system which can descend and ascend, to as deep as possible preferably (but not critical). Since it’s only going vertically, the buoyancy system doesn’t need to be complex. We're looking at a model from Nautilus Drydocks (the 3.5'' model) and are thinking of changing the pump and valve to reach greater depths. Do anybody have info and specs on the pump and valves currently used at the moment. We are wanting to keep the whole system under 24V, and am having trouble finding an appropriate geared or peristaltic pump online commercially.

Thanks,
subnewbie

[Subculture]

Lots of designs for peristaltic pumps available for 3d printing. As such one of the few pumps which lends itself well to that method of construction. Geared motors are cheap on ebay.