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Last time I had a valve shear on me I used a bit of 22 with a short pull on one end and a ball of Densotape on that end. Householder held it wedged in place inside the tank up against the tank connector while I snatched the valve. Worked surprisingly well and earned me a nice tip for not having to call out the oil company.
Reply to the thread, titled "Oil tank valve problem" which is posted in Boiler Advice Forum on Plumbers Forums.
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