SI Tech valves on Viking Pro

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The X2 valve is a little hard to "pop" open.

Make your left arm the high point...swing your left forearm out then in towards your chest quickly. This creates an overpressure situation that should open the valve if it's just simply "stuck" to the plastic.

TINY bit of silicone oil will help prevent sticking.
 
https://www.shearwater.com/products/teric/

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