The real question is what pressure do you have in it?
Does it vary from being hot to being cold?
How high above the boiler is the highest radiator in your home?
Does one half of your expansion tank sound empty when you tap it?
Is your pressure releif valve venting.
What temp is the water showing when operating.
Usually by the boiler drain valve. but what is happening that you want to lower/relieve the pressure. There may be a cause that you need to address also.
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