What is this HP seat?

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spoolin01

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Got a bunch of these years ago from a guy who seemed to specialize in USD, TUSA, and Poseidon. The bag was hand marked TR-911, but someone scratched out the TR.

They are about the size of the seats for many piston regs, about 1/2 inch across. P6040528.JPG P6040527.JPG

I'd like to pass them along if I knew how to describe them.
 

NotSure

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I'm not sure what regulator they go to but I have some seats like that with TUSA part # 11075 X6.
 
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spoolin01

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The TR-350/390 service manual from the '90s shows the part number 11075 for the HP seat. The pic of the seat looks black, with 4 sorta wedge-shaped protrusions around the perimeter of the core of the puck. So not identical to this, but somewhat similar. Could these be an earlier or later variant of the seat I wonder?
 

NotSure

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They look like yours but yellowed from age. The part number could be wrong but the other TUSA parts I have all seem to have correct numbers.

20190604_195647.jpg
 
https://www.shearwater.com/products/peregrine/

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