Its the water supply. The use to make a gas trap to put into water lines and vented above the roof of homes. Sad day if we have to carry something like that in the RV.
It was not that common until gas wells and fracking. Many videos of gas from fracking operations blowing fire out of faucets, in areas of Country, as well as houses heaving off foundations or downright exploding from gas seeping out of wells or cracks in the earth. In Oklahoma and elsewhere large quakes from such operations and large releases of gases.
