This worked well to patch the water tank in my RV. Two of the weld fittings were cracked so I found the fittings from a trailer supplier and my brother made the power tools on his CNC mill. My second attempt at spin welding didn't melt the fitting as well as I would have liked (should have rotated longer) so I used these strips to make sure there were no leaks around the edge of the fitting and to seal the cracks . Areas in the uncut part of the old fittings and the corner of the tank is right between the fittings. The micro butane pen torch worked well for welding. I simply removed the soldering iron tip and set the flame to half the maximum level.
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