How much air into Townshend 3-D Seismic Sink

FWIW, I haven't looked at my Townshend in years, but as I recall it had a small red led that indicated it was properly inflated and when the light went out it needed more air. It came with a wall wart to supply power to the led. It also came with a hand pump but no air pressure recommendations nor an air guage.

The older style Sinks had the red indicator led, but the newer ones (the 3D models) to the best of my knowledge do not. The 3D that I had did not. Regarding inflation, I was advised by the importer as follows:

"Just inflate the Sink so that there is no more than about 3/16 inch between the bottom lip of the top section of the Sink and the bottom of the bottom section, and all will be fine."

Thanks for responding to my post. Do you think this is an excellent isolation platform? The pump that came with my Seismic sink isn't the original but a bike pump. When unscrewing the pump from the Seismic Sink valve after pumping up the air bladder all the air comes out of the sink. Do you know of a way I can get around this problem, possibly an air pump that has a quick release instead of the screw-on type? Thanks.