American Standard Allbrook 0.5 – 1.0 gpf (1.9 – 3.8 Lpf) Top Spud Siphon Jet Urinal - AMS-6550001

Top spud. The Allbrook 6550001 takes the water inlet at the top of the fixture, through a 3/4 inch (19 mm) spud, so it pairs with a flush valve mounted above the urinal. If the existing rough-in on your wall brings water in behind or below the fixture for a back spud urinal, this one won't line up without moving the supply.

Anything in the 0.5 to 1.0 gpf (1.9 to 3.8 Lpf) band. The Allbrook siphon jet bowl is rated to flush properly across that whole range, so a 0.125 or 0.25 gpf high efficiency valve is the wrong pairing, it won't clear the trapway. For a low water building standard, spec the 0.5 gpf valve; for heavier traffic where drainline carry is a concern, go 1.0 gpf.

It swaps in cleanly if the opening you are replacing is already a top spud, 2 inch outlet wall hung urinal, which covers most commercial installs. The two things to check on the wall before you pull the old fixture are that the supply drops from above for a 3/4 inch spud and that the waste stub is 2 inch. Hanger mounting is covered, the wall hanger comes with the fixture. What won't carry over is the flush valve if the old one was a sub 0.5 gpf pint flush unit, that valve is below this bowl's flush range.

Siphon jet, which is what the Allbrook is. A siphon jet urinal has a jet at the base of the trapway that primes a full siphon on each flush, so it pulls the bowl contents out rather than just rinsing them down the face. Washout and blowout bowls rely on rim wash and velocity instead. For high traffic washrooms, offices, schools and stadium concourses, the siphon action is quieter and clears more reliably. The tradeoff is that a siphon jet needs the water to do it, which is why this one is rated 0.5 to 1.0 gpf rather than the pint flush numbers you see on washout bowls.

Four things beyond the fixture: a flush valve rated between 0.5 and 1.0 gpf with a 3/4 inch top spud connection, the spud coupling and gasket for that inlet, the 2 inch outlet gasket and connection hardware for the waste, and whatever wall support the construction needs. The wall hanger itself is in the box. Nothing else about the fixture is optional equipment, it is a plain fixture only bowl.

The Allbrook 6550001 is made in white only, MPN 6550001.02, so there is no color decision to make and no risk of a mismatched batch across a multi-fixture order. If you are standardizing a facility on white vitreous fixtures, ordering more of the same model keeps every restroom identical.