(1)
Provision shall be made for maintaining the trap seal of a floor drain or a hub drain by
(a)
the use of a trap seal primer,
(b)
using the drain as a receptacle for an indirectly connected drinking fountain, or
(c)
other equally effective means.
(2)
Where a mechanical device is installed to furnish water to a trap, the pipe or tube conveying water from the device to the trap shall be at least ⅜ in. inside diameter.