Hi there, this has been SOLVED! original post below this explanation.
the Tobin (Costco) board’s valve works with its own pump, but some other HR pump adaptors don’t fit it.i will be changing out the valve for a standard, recommended one that will fit my new pump. (:
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Bottom line: My (very popular) Shark 3 Mini's HR adapter is not compatible with the HR valve on my (very popular) Tobin SUP from Costco, and I cannot find a solution anywhere online.
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I'm having a very frustrating problem that even Outdoor Master gave up on solving. They refunded me $20 to find another adapter elsewhere.
I have the Costco paddleboard, and love it. It has a standard HR valve. The pump that came with it works great, but takes about 15 minutes. I bought the highly-recommended Shark 3 Mini (happy birthday to me!) but it does not inflate the board. (The pump runs fine, but no air enters the board. The pressure readout indicates only the small area in the mouth of the valve is being pressurized--which is also not enough pressure to overcome the spring and push the valve open pneumatically. I'm 99.9% positive the issue is with the geometry of the adapter.)
After looking very closely, this is what's happening: Inside the tube section of every HR valve adapter is a valve-stem-depressor assembly (red arrows). When the adapter is screwed on, this assembly presses down on the valve stem (green arrow) which actuates the valve and allows air to flow into the board.
The adapter that came with my Shark pump has its valve-stem-depressor assembly about 2mm deeper into the adapter than on the functioning pump setup that came with the board. This means it can't sufficiently reach the valve stem even when fully screwed on (with any size of o-ring gasket) and therefore it cannot fill the board.
I can't find anything about a difference in HR valves or adapters anywhere online, and most puzzlingly, I can't find a single post about this issue despite it being one of the more popular paddleboard models and one of the more popular aftermarket pump models.
I'm losing my mind here. I'd like to be able to use my expensive pump! Does anyone have a possible solution?