solar shower opening | whats inside | how it works

[@censored7881]

Just what I needed, thank you very much. Intuitively I figured out how it all works, except for the little hole near the top of the pipe that delivers hot water to the shower head. So, to winterize the shower, one could remove as much water as possible first, and then use propylene glycol in a squeeze bottle with a hose-end adapter, put the shower handle in cold/open mode, dispense propylene glycol until it comes out of the shower head, then turn the handle to hot/open mode, and dispense enough to add a sufficient amount of propylene glycol to the bottom of the shower to prevent freezing. I understand that thoroughly removing water before freezing weather is best, but after having my shower sustain damage last year, I want to be doubly sure. For 8 years I thoroughly emptied the shower before winter and had no issues; last year I got lazy/stupid and simply relied on the drain plug and called it good... It wasn't.