I bought a small vacume motor off ebay and made one out of a tire pump... lol as far as controlling your pressure... go down to the pet supply store and in the fish dept... pick up a pack of air supply valves and adapters .. like $3... you can use one of the tees and valves to make it so you can control the leakage into the system... attaching a photo of one I made an noon today.... just cut you line and insert the tee.... cut a short length of line and add the valve... before doing this make sure what size your air line is... and the tee and valve fit... the one I found fit like 1/8 to like 3/16 line...
or just take one of the valves in insert it in the line and use it to control how much airs is removed from the domes... the motor wont see any more strain than its seeing now... maybe even a little less since its removing less air... if you lines are tight you can also turn off the motor and shut the valve and they should remain pressurized for a long time.... hours....
or just take one of the valves in insert it in the line and use it to control how much airs is removed from the domes... the motor wont see any more strain than its seeing now... maybe even a little less since its removing less air... if you lines are tight you can also turn off the motor and shut the valve and they should remain pressurized for a long time.... hours....