Nozzle box

Nozzle boxes (also called FLUDD Pack Boxes) are colored boxes found in Super Mario Sunshine. They have Professor E. Gadd's emblem on them, and they contain FLUDD's different nozzles. These consist of the Hover Nozzle boxes (also called Blue Nozzle Boxes), gray Turbo Nozzle boxes (also called White Nozzle Boxes, Turbo Nozzle Power-up boxes, Black Nozzle Boxes, or Black Hidden Boxes), and red Rocket Nozzle boxes (also called Red Nozzle Boxes  or Red Hidden Boxes). FLUDD begins each course automatically equipped with the Hover Nozzle. All three types can be found in Delfino Plaza, whereas most other courses feature at least two types. Pinna Park and Sirena Beach are the only two areas in the game that do not contain nozzle boxes.

Mario can open the box and equip the nozzle simply by jumping on the box. FLUDD can have only two nozzles equipped at a time, but one of them must be the standard Squirt Nozzle. This means that if Mario wants to change nozzles, the Hover Nozzle is replaced. Within a course, blue Hover Nozzle boxes are accessible from the start, but most of the gray Turbo Nozzle boxes and red Rocket Nozzle boxes appear as holograms at first. Mario must find and open the one gray or red nozzle box in the course that is solid (and that is usually located in a hard-to-reach place) to make all the other nozzle boxes of the same color solid. Whenever Mario switches Nozzles via a nozzle box, his water supply is automatically refilled. Throughout Isle Delfino, there are 10 Hover Nozzle boxes, 12 Rocket Nozzle boxes, and 11 Turbo Nozzle boxes.

Trivia

 * Although Mario can break open nozzle boxes while riding on Yoshi's back, he cannot physically collect whatever nozzle attachment comes out of the nozzle box until he dismounts Yoshi.
 * If Mario gets on and off Yoshi, FLUDD refills and its second nozzle switches to the Hover Nozzle.