Originally Posted by Dennis.G
Insulated hot water lines are nice in some respects, but not really needed for most domestic water suppy applications. The insulation reduces the rate of heat loss from the pipe, but given enough time the pipe will cool down to ambient temperature anyway. As insulation take up space and just complicates things, I would not do it. Do not insulate.
There's a neat system of covered pex for use underground we are looking at for a boat soon, a bit of insulation, not a lot of wasted space, but will allow easy replacement if ever needed, since the sleeve allows new pex to be inserted without pulling out tanks
to get to fastening points. Easier mounting as well as better protection.
Minaret: I'd seen that before online but the stainless crimps for connections, and sealand fittings with locking rings to the tanks
worked quite well enough so I didn't really dig further. Couldn't quite make head
or tail of expansion method until your explanation.
Perhaps it is a tool the OP could rent? It does seem a better solution, looks like the same method sealand uses for tank senders.
As a side note, Milwaukee has fixed 2/4 of the reasons I went dewalt over their 12v system last year. I took another look after your observations on them in your thread.