Protect plastic/rubber screwcaps of my drip irrigation systems with WD-40 Specialist Siliconspray

To prevent having to exchange the tubes and other components of my drip irrigation system (because freezing of water in the system) I maintain this system before the winter starts. 1st step: Screw off the caps at the end of the tubes and open the valve. 2nd step: With high pressure blow air trough te system, to get the water out. 3rd step: Spray the caps with WD-40 Specialist silicone spray to prevent them from cracking, to maintain the rubber o'ring inside and to enable the cap to get of easily next year again. 4rd step: screw the caps on again