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Product Frequently Asked Questions:
Commercial Water Closets


1.6 gpf water closets and flush valves have been the commercial baseline for maximum flush capacity since 1992. In more recent years, the 1.28 gpf water closets and flush valves have become more popular for LEED projects and water conservation efforts. The 1.28 gpf is even becoming the baselines in certain parts of the U.S. ​

For commercial toilets, anything lower than 1.6 gpf that has passed industry standards is acceptable for use.  At this time 1.6 gpf and 1.28 gpf along with Dual Flush systems are the most common for flush valve operated toilets.​
A top spud fixture refers to a flush valve connection that is on top of the toilet generally located behind the seat.  A back spud fixture has a connection for the flush valve located on the back of the toilet.  In most cases a back spud fixture will use a concealed flush valve.
A carrier is a steel fixture that goes behind the wall to hold “wall hung” fixtures off of the wall….i.e. toilet, sink, urinal and for floor mounted back outlet bowls to secure the drain assembly to the fixture.  It is required any time a wall hung fixture is specified.

The siphon jet bowl is attached to the carrier with four mounting studs arranged in a rectangular pattern whereas the blowout bowl is mounted on three studs arranged in a triangular pattern, point down.  Additionally a siphon jet bowl jet is located in the sump.  The jet in a blow out bowl is located in the trap way.  Siphon jet bowls can flush at 1.28 gpf whereas blow out bowls are typically 1.6 gpf and higher water usage.

What is the difference between standard height and handicapped/elderly height fixtures?​​
Handicapped/elderly height (also known as ADA height) has a rim height of between 17 inches and 19 inches measured to the top of the toilet seat.  Standard height is typically 15 inches to the rim height.

Both terms are used interchangeably to describe the flushing mechanism for the toilet.  

To be able to supply the minimum 25 gallons per minute required to properly actuate the flush valve and fixture.

Both types of flush valve are sensor-operated. Battery type flush sensor flush valves are hand-free activated units that are typically operated on alkaline or lithium type batteries. Most studies conducted can state battery life lasts between 3-4 years in most flush valves. For hardwired flush valves, these units tap into a facilitiy's electric supply once installed. They are powered through transformers that can convert the electric current down to the proper amps required to activate a flush valve. There also hands free sensor operated devices.​