The StratoLauncher IV Ultimate Upgrade Kit is comprised of 4 components: mini ball valve, Q-Release M plug, barbed fitting, and Q-Release connector. Installing this kit on the StratoLauncher IV Deluxe model will upgrade it to the StratoLauncher IV Ultimate model. This will enable connecting to a tank sprayer, which will fill your rocket with water quickly while mounted on the launcher. The StratoLauncher IV Ultimate Upgrade Kit can be installed on the standard StratoLauncher IV model to add this water fill system enhancement.
Buy 2 gal. tank sprayer here, which will connect to the barbed fitting on this Ultimate Upgrade Kit.