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Yesterday, the Taco pressure reducing valve on on the mains feed to our boiler has started to leak (modest drip) after I was using it to purge air from our heating system. Beyond putting a bucket underneath & getting it replaced (if nec.) next week, should I worry? Is it likely to turn from a drip to a flood? Is it just a question of adjusting a screw etc? We have had the system (& the valve) for a few years with no leak. Any guidance would be great. Have called a plumber but not heard yet & until I know I won’t cause a flood, I have isolated the valve and necessarily turned off the heat.