Drum gauge with faucet
Your review: Most of the barrels we purchase have been used many times over and the threaded hole seems bigger on them. The recommended tape can be replace by other products.
Pros: Tells you right where the level is
Cons: Instructions never said anything about loosening up the large barrel plug first, this must be done and re-tightened to a point where it won't leak but will be loose enough to enable you to let the air out