Metal coolant bottle

[Mark Noeltner <mark@xxxx>]

I just got a metal coolant bottle in with some other parts that I bought.
It's aluminum, with welded connections. It also has a piece of tubing
installed that lets you check the level of coolant in the bottle without
opening it. Picture:
http://www.buffalochips.org/delorean/water-bottle.jpg

1. Who sold this originally? Just curious, as it doesn't really matter.

2. The tubing for the level check is getting pretty yellowed. Does anyone
know where I can get some 3/8" ID clear tubing that will handle the
temperatures and pressures of a cooling system? This is a fairly heavy
walled tubing. Much heavier than what I'm finding at the local hardware
stores. Plus, what I've located so far has a max temp of 165 deg (plus or
minus a few degrees depending on who made it). I was figuring 250 to 300
deg with at least 25 lbs of pressure to be on the safe side.

It is only a 4" piece of tubing, so it may be that they used the 165 deg
stuff figuring that a short piece like that would hold up fine.

Anybody know anything about this bottle? My original plastic bottle has
been holding up great, but I figured I would install this alum bottle this
winter to play it safe.

Thanks!

Mark N
VIN 6820