AZ modified the barrel and it might be hard to find something to fit. Done back in the day when moderators were questionable made so it will not fit a CF rifle. I have one in my safe which needs to be resealed If i can get someone to work on it..
Do you use it in the box as shown? If so, the cooling vents are possibly blocked. Probably not the problem but it could cause overheating. Check for air leaks around the hose connections and the vent is fully closed.
I don't see a UL, ETL or some other listing safety authority. 2 wire power should be covered by the listing. authority. A listing authority won't guaranty it works but verify its safe. The pump I use has a CE sticker.
can you read the part number on the part? If it is a 78 series, it reads 7812, 7805 ect. with last 2 numbers are the voltage. Best to look it up if its something else.
I replaced the shroud with a non sliding one to install it. Used a l bigger shroud which works fine, bur cannot compare sound levels. Mine is a mk1 in 30 cal. Donny might have a shroud which works.