Client called us out due to them buying a new stove, and the installers refusing to install it because of the improper gas line coming through the floor. The line was a flex line, and if it penetrates a wall or floor, it must be hard piped. There was a block wall directly below which is why the previous guy did what they did. We chipped out a small portion of the block wall in the crawlspace, then reworked the gas line from the old flex tie in, just below the floor up to just above the floor with a new gas shutoff and gas flex line per code. Turned gas back on and tested, no leaks. 1 yr parts and labor warranty.