For those using 4 Liter containers of CarPro product these have to be the most well made I have used and durable for some heavier items have fallen only on the cap part of the 4 Liter jug (thank God!) and at most I can see is a hint of a scratch and haven't cracked the plastic.

The red lever is simply lifted to the right for open flow then back to the left to close. These also may work with Koch Chemie 5 Liter products although I haven't tried but they look of the same size, couldn't hurt. As a CarPro product I highly recommend for busy shops.

Excellent little spout and it also fits the 5L Koch-Chemie Jugs which have the 51mm lid top.