Hotun Hiflo 15mm x 32mm Odour Seal Dry Trap Tundish HHB100C - Black The revolutionary hotun hiflo dry trap tundish allows the Temperature & Pressure relief valve to connect directly to the internal waste or soil pipe eliminating the need for external discharge. The non-return valve within the hotun Hiflo dry trap Tundish stops any foul odours from entering up through the Tundish and back into the building. The hotun dry trap tundish allows for easy identification of the historical PRV discharge by touch without the need to dismantle the connection. The hotun hiflo has been approved for use by several big-name boiler and water heater manufacturers and with it’s 10 year guarantee it is the perfect solution to any hot water system. Dry Trap Tundish Allows the PRV discharge to be compliantly connected to drain without odours Eliminates the need for external discharge Connects directly to internal waste or soil pipe Approved for use by many major companies Suitable for Unvented Cylinders