A p trap gully stops smells from the underground drainage system from seeping out into the air around a property.
P traps gullys are available with 90-degree or 45-degree outlet pipes.
The top of the gully attaches to a hopper which collects rain and wastewater. Hoppers are either rectangular or square in shape.
The outlet pipe is elevated so that incoming water settles at the base of the gully. This is the key to the operation of a p trap gully: smells and gases can’t get through the standing water.
P trap gullys are difficult to clean with a drain rod because of their shape, so it’s best to clear the hopper top of any excess leaves and use a plunger or jetting hose to clean out the trap when necessary.