TL;DR
Yellow jacketed CSST is first-generation corrugated stainless steel gas tubing with a yellow polymer cover, flexible fuel line routed through framing like electrical cable but carrying a documented weakness: nearby lightning can induce energy that arcs through the thin tubing wall and ignites the gas. Manufacturers and codes therefore require direct bonding, a 6 AWG copper conductor from the rigid pipe near the meter to the grounding electrode system, a retrofit many homes plumbed in the 1990s and 2000s still lack.
What it means
Yellow jacketed CSST is first-generation corrugated stainless steel gas tubing with a yellow polymer cover, flexible fuel line routed through framing like electrical cable but carrying a documented weakness: nearby lightning can induce energy that arcs through the thin tubing wall and ignites the gas. Manufacturers and codes therefore require direct bonding, a 6 AWG copper conductor from the rigid pipe near the meter to the grounding electrode system, a retrofit many homes plumbed in the 1990s and 2000s still lack. Newer black arc-resistant jackets dissipate that energy, and yellow runs visible at the water heater or furnace are how inspectors raise the bonding question.
Where it sits in the glossary
Yellow jacketed CSST is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
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