Intake for whirlpool-type bathtub

An intake, comprising:

• a hollow body having an inlet, an outlet and a hollow interior communicating said inlet with said outlet;
• a vent extending from outside of said hollow body to a position in said hollow interior so as to allow communication of said hollow interior with the outside of said hollow body;
• a shutter operable between a rest position in which said hollow interior is in fluid communication with said vent and an operating position in which said shutter closes said vent off from said hollow interior, said shutter being adapted to be in said operating position to close said vent during a flow of water from said inlet to said outlet until the flow of water falls below a threshold value, at which point said vent comes into fluid communication with said hollow interior;
• wherein said shutter comprises a movable member biased by a spring to said rest position and a sensor adapted to be actuated by the flow of water to displace said movable member against the force of said spring to said operating position;
• and
• wherein said sensor comprises a member which closes said inlet when said movable member is in said rest position.

An intake for a bathtub, comprising:

• a water inlet, an interior and an outlet adapted to be connected to a pump, for the flow of water from said inlet, through said interior, to said outlet;
• a vent communicating with said interior and extending outside thereof for communicating with ambient air;
• and
• means for substantially shutting said vent in response to a flow of water being caused to move toward said outlet and for opening said vent when the flow of water falls below a predetermined threshold value so as to enable ambient air to enter said interior through said vent.