Two piece hose with 4 different threaded connectors for various spark plug holes. There is a quick connect coupler. Somewhere it leaks. Going to see if Mattco will repair it. My son buys a lot of their stuff.
Dont feel bad, I went to use my Snap On tester the other day and its a POS too. Won't hold pressure. Used a cheap harbor freight tester that still works like new. Go figure