I found this on the web. It can be applied to our cars as well -
The earlier heater valves for the Midget/Sprite seem to be quite
plentiful. If you have a 1976 like I do, you know that the new valves
are not available. The used ones often leak as well, (I speak from
experience here on that matter).
A trip to your favourite plumbing supply store will reveal many copper
elbows, adaptors and different sized pipe. A few minutes with a torch,
some solder and you can solder up a connector that will replace the
leaking valve. True you can't turn the hot water to the heater off, but
with the heater doors closed, you won't notice it at all.
Polish up the copper, add a clear coating to prevent tarnishing and it
looks quite nice.
It will keep you on the road with no leaks until you can find a good
heater valve or they start making reproduction valves.
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