Commonly called: odour seal tundish, dry trap tundish, trap tundish, tundish valve, overflow tundish trap, dry odour seal tundish, sprung valve tundish, non return tundish
hotun’s patented and simple, but visually appealing style, has many advantages over other more expensive and bulky options
- To go to the alternative compliant options page, click here
- To see all the regulations that need to be considered when making this type of connection, click here
- To see some video clips of hotun discharge flow tests (trickle and full-bore), click here
- To view the full operation, installation, service and warranty instructions, click here
- For typical unvented installation types, click here
* It is compliant (when fitted in accordance with the installation instructions) with all necessary Water and Building Industry regulations, (in force wef Mar 2014) provided that the waste and/or foul stack can be demonstrated to be able to withstand the effects of the expected temperatures being discharged. Please note, Polypropylene (PP) and High Density Polyethylene (HDPE) are generally accepted by building control to be used as suitable materials in this application. However, if in doubt, please contact your local building control for advice before installation.
** The spring/valve/diaphragm assembly is precisely engineered to hold the diaphragm shut under normal operating conditions (to prevent odours being ventilated back up from the foul waste pipes or drain), but still allow the valve to open with a minimal quantity of water in the upper chamber. We call this the trigger point and is set to release at between 5ml and 25ml of water. The upper chamber will hold 50ml of water before overflowing.