What brand of hand pump do you recommend?
I bought a $60+ one at harbor freight at one time, but if I keep it connected to the tube it loses vacuum pressure within about a minute. I can disconnect the tube from the cylinder and the vacuum seems to last for about 10 minutes. Perhaps it’s just the particular hand pump I bought that is the problem and makes it so I have to pump really often to maintain the vacuum?
Do you increase the vacuum pressure and then disconnect, or do you pump off and on vacillating between pressures? You might have already mentioned this somewhere, but I don’t recall.
Are some hand pumps noisier than others? My house is absolutely silent at night except for fans, and the stable noise of an air pump is hardly noticeable. The squeaking of my hand pump though is really noticeable.
I agree that you always should have a pressure gauge. Years ago I rigged a powerful air pump from parts, but I noticed it fluctuated in the vacuum pressure it produced between 25 inHg and 7 inHg. I never did figure out why it did that because the fish air pump at 5 inHg was more appropriate and I salvaged the rigged pump for parts.
Starting: 7"bplx5.2" 2017 (shrunk from disuse)(originally 8"bplx4.5", gained to 9"bplx6")
Current: 9.0"bplx6.125" 2020
Goal: 11.5"bplx7" 2021.