It's even easier if you've got a compressor with a pressure regulator.
Just adjust the pressure up until the cap opens.
Randall wrote:
>> Any ideas as to how much the spring should be compressed to
>> hold the pressure?
>>
>
> What I did was to remove the plug where the heater valve used to be, and
> temporarily put in a pipe tee with a Schrader valve on one leg and a hose
> barb on the other. To the hose barb I connected my vacuum test gauge (which
> also reads pressure to 10 psi). Pressurize the system with an air hose
> through the Schrader valve, then watch what the gauge does (and where the
> air/water comes out).
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