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Help with Pneumatic speargun pump hack- Technisub

Thread Status: Hello , There was no answer in this thread for more than 60 days.
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Well-Known Member
Oct 13, 2011
I have a Technisub Ranger without a pump. I would like to rig a Schrader valve stem (bicycle) to a threaded fitting to charge the gun from a bike pump or compressor. I once did this with a Mares. Does any one have information on the type of thread used on a Technisub charging port, or other ideas on how to fill this gun DIY?
Technisub use M17 x 1.25 metric screw threads on their guns. Besides the thread size you need to check on how the pump seals into the rear inlet valve port and this will be the same as how the inlet cap seals when it is screwed in. Technisub pumps have a smooth shoulder in front of the pump threads that seals inside an "O" ring that sits inside the inlet valve body. By way of comparison Mares have the "O" ring seal installed on the pump nose and it fits into a smooth bore in the inlet valve body, hence it is a reversal of the system used in the Technisub guns.
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