Takes a few initial pumps to prime the device and for the gauge to start increasing in pressure. Tried it on the bathtub drains and the water started to flow more freely down the pipes! Instructions could be a bit more clear, but after you figure it out, it's not hard to operate.

Interesting product

works good

get them on sale, they're great

Great gift for my landlord brother :). Got the first clog fixed without a problem.

Took care of a bathroom sink clog in the first use of this tool! No more Draino needed so far. Works great.