The siphon jet bowl is the most common because its action is relatively silent and economical in water usage. It operates by a jet of water directed through the trapway which quickly fills and starts the siphonic action immediately upon flushing. Its quiet action and large water surface, among other features, make it the most desirable bowl type. It is readily distinguished by the four bolt holes which receive the fixture support studs.

The blowout bowl is particularly adapted for public use as in airports, stadiums or plant washrooms. Its action is a driving one of high velocity. It is economical in water use and has a large water area and an unrestricted trapway. It is also more noisy than the siphon jet bowl because of its direct jet action. The blowout bowl is secured to the supports by three studs.