Hose end spray nozzle

Apparatus for selectively mixing fluids comprising:

• a body, said body defining a first fluid passage which extends therethrough, said first fluid passage including a converging portion and a first constant diameter portion located downstream of said converging portion;
• coupling means for connecting a source of first pressurized fluid to said body, said coupling means delivering the pressurized fluid to said first fluid passage whereby the velocity of said first fluid will be increased during flow through said converging portion prior to flow through said first constant diameter portion;
• and
• tube means rotatably mounted within said body, said tube means being closed at a first end and extending outwardly from said body to an open second end, said tube means intersecting said first constant diameter portion of said first fluid passage and extending partially into said constant diameter passage portion from a side thereof, said tube means thus forming a restriction in said first fluid passage, a low pressure area being created downstream of said restriction, said tube means being provided with a port extending through the wall thereof to establish communication between said first fluid passage and the interior of said tube means whereby the low pressure area downstream of said tube means may be placed in communication with the second end of said tube means to thereby establish a flow of a second fluid through said tube means into said first fluid passage for mixing with said first fluid, the rate of flow of the second fluid being controllable by rotation of said tube means to vary the area of said port which is in communication with said first fluid passage.