This float holds the mist maker unit at the optimum depth in deeper water environments for optimum fogging results. Mist head compartment 1 7/8\” diameter x 2.5\” deep. Compatible with mist heads 1.5\” to 1.78\” diameter x 1\” deep. This float holds the mist maker unit at the optimum depth in deeper water environments for optimum fogging results. 4\”(outside dia.) x 1 7/8\” (inside dia.) x 2.5\”(h)