A short follow-on to the drain valve access...
The fresh water drain tube is short and way up there! First drain was a messy ordeal A piece of flexible tubing that happened to be sitting on a workbench fit perfectly snug over the exit tube. This tubing was from a fresh water fill.
On the end I attached a quick release free flow hose end and it too was almost a perfect fit but required just a little epoxy to ensure it stayed attached for travel.
Now it’s easy to drain water by hose directly to flower beds.