Hello to anyone who uses a vacuum pump for depumping - I just recently purchased this InvaCare pump off of Ebay and tried using it today to degas. It draws a vacuum easily while running but as soon as I turn it off, I can hear air whooshing and the vacuum is gone. The air seems to be rushing in somewhere internally. I think it is supposed to hold a vacuum - isn't that correct? Has anyone else had this problem?
Thanks for any ideas,