The MacDonald SL-TP is from our SOLO range of multi purpose water controls. The MacDonald SL-TP electronic timer controlled trap primer is designed to maintain a permanent trap seal in floor wastes.
Where floor, sink or shower wastes or gulley traps are infrequently used due to remote location or where high ambient temperatures or high airflow movements are likely to cause excessive trap dry-out, the MacDonald Model SL-TP should be installed.
Mechanical trap primers work, when other plumbing fixtures are operated, thus initiating a pressure drop in the supply line. The inherent failure of these types of devices to provide the necessary seal, is because the area where trap dryout is most likely, is where taps and valves are not being used anyway.
Because the SL-TP does not rely on pressure drops, it is able to maintain the trap seal even when the building is unoccupied.
