An anti-backflow plumbing fitting (10, 102) includes an inlet end (16, 108) with a body inlet fitting (20, 118) that is in fluid communication with an inlet passage (40, 122) and an outlet end (18, 110) with a body outlet fitting (30, 144) that is in fluid communication with an outlet passage (48, 152). The body bounds an interior area (36, 106). An axially elongated air gap opening (56, 114) extends through the cylindrical body wall. A further passage (62, 134) extends from outside the body to an internal passage opening (66, 138) that is in an opposed radial direction from the air gap opening. The air gap opening operates to reduce the risk that contaminated liquid may back up into the interior area and reach the inlet passage. A cylindrical outlet end outside wall portion (28) enables the body to be engaged in fluid tight relation with a liquid removal conduit (80). A cylindrical inlet end outside wall portion (26) enables the body to be engaged in fluid tight relation with a liquid delivery conduit (82).

A drainage device is provided that includes an inlet opening connectable to a sanitary appliance, a drainage opening connectable to a sewage pipe, and a closure section arranged between the inlet opening and the drainage opening. Passage of gas between the inlet opening and the drainage opening can be prevented by filling the closure section with a liquid. The drainage device further includes an actuating means and a vent opening. In a rest position, the actuating means closes the vent opening. In an activation position, the actuating means releases the vent opening. In the activation position, a gas passage between the drainage opening and the vent opening is allowed. Other aspects are described and claimed.

A drainage device is provided that includes an inlet opening connectable to a sanitary appliance, a drainage opening connectable to a sewage pipe, and a closure section arranged between the inlet opening and the drainage opening. Passage of gas between the inlet opening and the drainage opening can be prevented by filling the closure section with a liquid. The drainage device further includes an actuating means and a vent opening. In a rest position, the actuating means closes the vent opening. In an activation position, the actuating means releases the vent opening. In the activation position, a gas passage between the drainage opening and the vent opening is allowed. Other aspects are described and claimed.

The present utility model provides a modularized induction flushing device for a urinal and an induction urinal. The modularized induction flushing device comprises a water inlet and outlet assembly, a water drainage assembly, an electromagnetic valve assembly, and a power supply assembly, wherein the modularized induction flushing device further comprises an induction module, the induction module is associated with the electromagnetic valve assembly and is attached to the water inlet and outlet assembly and/or the water drainage assembly, wherein the induction module is configured to be switched between at least two induction modes in a replaceable mode, and the electromagnetic valve assembly responds to different induction modes of the induction module to control flushing of the urinal. According to the modularized induction flushing device of the present utility model, the replaceable induction module is provided, the induction modes can be switched according to different needs, the use experience of a user is improved, the modularized induction flushing device is easy to implement, the performance is obviously improved, the modularized induction flushing device can be applied to various occasions, and the diversified requirements of the user are met.