Rotary rinse nozzle for aircraft waste tanks

A rinse nozzle for mounting in an aircraft waste tank which projects at least partly into the interior of the tank, said nozzle comprising

• a tubular stem having a first end and a second end, made of polytetrafluorethylene, including external threads at the first end, the external threads formed on a sufficient portion of the tubular stem such that they extend through an opening in a wall of the aircraft waste tank and are securely mounted therein so that the second end of the stem extends into the tank interior, and including a plurality of first openings circumferentially spaced no more than about sixty degrees apart in the sidewall of the stem, said stem having a head section with a first radius, a mid-section positioned at the first openings, the mid-section having a second radius which is less than the first radius, and a bottom section having the first radius, said stem being open at said first end for receiving cleaning solution and closed at the second end,
• an annular collar, made of polytetrafluorethylene, rotatably disposed on the stem about the first openings, said collar including an inner concave surface and an outer convex surface and a plurality of circumferentially positioned second openings, said second openings being spaced apart no more than about twenty-five degrees and at least some of which are directed outwardly and upwardly and at least some of which are directed outwardly and downwardly and in a direction generally opposite to the direction of rotation of the collar, to thereby cause the collar to rotate as cleaning solution supplied to the stem flows through the first openings and out the second openings, and
• a mounting ring, made of polytetrafluorethylene, fixable on the stem below the collar to support the collar.