includes an arm generally designated by the numeral 37 which extends outwardly and is connected at its proximal end zone 38 to the support the tubular arm includes a distal end zone 40 and an intermediate zone 42 which extends outwardly and downwardly between the proximal and distal end zones of the tubular arm the arm extends downwardly so that the distal end zone is slightly above the normal waterline of the pool and the distal end zone is provided with an opening 44 which is smaller than the inside diameter of the tube and this opening faces inwardly toward the proximal end zone preferably a fitting 46 is provided which has a mouth 48 sized to fit over the terminal end 50 of the distal end zone and includes an angularly downwardly extending portion 52 terminating in a closed end 54 with an extending stud 56 to which a float 58 with a central through opening 60 is mounted and captivated by means of a bolt 62 in threaded engagement with the exterior or distal surface 66 of the float captivating it on the stud the opening 44 may be a pattern of openings to direct a spray toward the proximal end with respect to the means to mount the proximal end it may comprise a fitting 70 having a central recess 72 sized to receive the proximal end 38 therein with the terminal end 74 in close abutting relation with the shoulder 76 in the end wall 78 which has.