I used it for engine cleaning work with carbon cleaner SX - 7000, but I am satisfied that delicate flow rate adjustment is possible. However, if you set the adjustment part to the open state with hose Φ 7, it falls so you want a fall stop. (It stopped lightly at the hose with a binding band on a falling stop.) Also, although it was another commodity, I searched for a flowmeter (a thing that can check the state of falling in a drip at the time of dripping), but there was not it. I think that roller clamp and flowmeter are to be used as a set.