I’m told there is a device for installation in floor drains that eliminates the need for a trap primer. Lets water in but no sewer gases out. Is there such a thing?
Thanks Michael, hadn’t come across that before. :)
That must be it. Thanks.
Another system is made by DRANJER
http://www.dranjer.ca/pages/about.htm
Another system has a small rubber ball that is held up against a rim by a small spring to form an air seal. When water runs to sit on the ball, the extra weight allows the ball to sink a bit, allowing the water to drain. After the water drains, the balls rises to form the seal again.