Sun-Mar’s low-profile (13″) low flow 1 Pint Flush Toilet is designed for use with their central composting toilet systems. The 1 Pint Flush Toilet is required for the Centrex 1000 composting unit, but can also be used with holding tank systems. From the manufacturer:
Using about one pint per flush, these ultra low flush toilets provide all the advantages of a flush toilet while minimizing water usage. They are ideal for use with Sun-Mar Central Composting Systems, but can also be used with holding tanks, overloaded septic systems, and in RV’s.
A simple foot pedal flush opens the water valve and gate when pushed down, and fills the bowl with water when lifted. After flushing, a small amount of water is held in the toilet bowl which is sealed by a self-cleaning ball valve and teflon seal. Even gravity-fed water from a roof tank is sufficient to flush a 1 pint flush toilet. In winter they can be flushed manually using a container if necessary.
The 1 pint flush toilet has a regular sized toilet seat. In some instances, extra height is needed to allow the toilet to gravity feed to the composting unit. Where this is the case, consider the SM-510 regular-height low-flow toilet instead.