So, I was able to repurpose the old hose by cutting it into 3 pieces to make a Y-shaped antifreeze delivery hose to winterize the outdoor shower mixer/hose/head. UPDATE: Turns out that I only needed a 3/8" plastic Tee from Lowes, because I was able to use the old toilet hose that I had replaced to fit the new shutoff valve I installed. I would also get a 1/2" barbed Y-connector to connect 3 pieces of the hose & 2 screw-on fittings from shower mixer to a funnel, then cap for the winter. LDR Industries 516 B1210 Nylon Tubing, 1/2" x 10', Clear SHURFLO (244-2926 1/2" x 14 NPT x 1/2" Barb Straight Wingnut Swivel Adapter Just need to get the extra screw-on fittings & pieces of hose to facilitate that. I will likely be adding antifreeze next winter to the toilet valve & the outdoor shower mixing valve/hose/head, in addition to the water pump & P-traps.
If Thetford would just get rid of the long black inner tube so that water could easily drain, that would save people from a lot of headaches, both for repairs & winterizing. I already disconnect & fill our water pump with antifreeze for the winter, so I may do the same for the toilet.
Pouring into a small 3/8" fitting with small opening in its built-in washer would be a challenge, unless you used a syringe to inject it or connect a larger fitting. Doing this after blowing out could provide extra insurance. However, I'm thinking that if one were to raise the end of the hose up as high as possible (carefully, to avoid tension on its connection to the valve) & pour antifreeze slowly to fill the hose, then open the toilet valve to let it drain into the bowl, that could leave enough antifreeze in the valve for winter protection. But, we've winterized twice this way with cold single digit winter temps, and no problems so far. Frankly, I'm surprised that even thoroughly blowing out the line with plenty of high pressure air would remove every bit of water from this water trap design. This might help drain the hose, but not sure if it would do anything for water that might be trapped between the inner black tube & white plastic tube fitting. Interesting idea about disconnecting the toilet hose for the winter.
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