Mouth piece assembly

A mouth piece assembly comprising:

• a mouth piece unit having a pivot connected to a first end thereof and a hollow tube extending perpendicularly from the pivot, the hollow tube communicating with the pivot, a seal ring mounted to the hollow tube;
• a first connector having an insertion slot defined axially in a first end thereof and a passage defined axially in the first connector and communicating with the insertion slot, a central hole defined through one of two parts separated by the insertion slot and communicating with the insertion slot, the pivot inserted into the insertion slot and the hollow tube inserted into the central hole, a second end of the first connector having a first groove and a second groove defined in an outside thereof, a seal ring engaged with the second groove, and
• a second connector having a body at a first end thereof and an engaging slot defined in an outside of the body, a locking key removably engaged with the engaging slot, the second end of the first connector inserted into the body and the locking key engaged with the first groove,
• wherein an end wall is located in the engaging slot and an engaging portion extends from the end wall, a guide rib is located in the engaging slot and located opposite to the engaging portion, the locking key is a C-shaped member and has two hook portions on one end thereof and a guide slot is defined in an inside of the other end of the locking key, the hook portions are engaged with the engaging portion and stopped by the end wall, the guide rib is movably engaged with the guide slot, and a connection tube is connected to the second end of the second connector, and
• wherein the second connector is connected to a cap which has a separation board on a top thereof, an engaging slot is defined in the cap and a locking member is engaged with the engaging slot, the locking member has an extension plate extending from one end thereof and a locking plate is connected to the other end of the locking member, a spring plate is located between the extension plate and the locking plate, a protrusion extends from the locking plate, the engaging slot has multiple air inlets defined in an inner surface thereof and an air valve is cooperated with the air inlets, a hole is defined in an end of the engaging slot and through the cap, the second connector is engaged with the hole and a pipe is connected with the hole, the engaging slot is located on one side of the separation board and a finger hole is defined in the other side of the separation board.