u/Lightningstruckagain

Image 1 — Chlorinator cap stuck TIGHT
Image 2 — Chlorinator cap stuck TIGHT
▲ 8 r/pools

Chlorinator cap stuck TIGHT

Not sure if it’s the 100+heat, maybe an under lubes O-ring last time I opened or what, but I can’t get the cap unscrewed here. You can see I already chipped off a bit trying a runner mallet. Any advice that doesn’t require cutting?