Replacement gel for Falcon Waterfree and Aridian waterless urinals. This is a replacement part and not required when purchasing new Aridian and Falcon Waterfree waterless urinal cartridges.  Each cartridge comes with a sachet of this sealant. This sealant sachet is primarily to replace the gel in a cartridge that has been accidentally degraded as a result of incompatible cleaning chemicals being used.