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CSST Pipe & Fittings cover corrugated stainless steel tubing and the matched connectors that make gas line installation faster, cleaner, and easier to route than rigid black iron. CSST bends around obstacles, reduces the number of joints, and cuts labor on natural gas and propane projects from new builds to retrofits. Its stainless construction resists corrosion, while engineered fittings deliver secure, repeatable seals for appliances like furnaces, water heaters, ranges, fireplaces, generators, and outdoor grills. With sizes from 3/8 in. to 1-1/4 in., and options in standard yellow jacket and black CSST with enhanced jacket and UV resistance, you can tailor a gas piping system to the load and environment.
This category includes flare-style fittings, couplings, tees, elbows, manifolds, termination fittings, appliance connectors, bonding clamps, striker plates, grommets, and protective sleeves. Most CSST fittings do not require flaring tools; they use a ferrule and nut system that assembles with two wrenches. Cuts are clean with a CSST/tubing cutter, and jacket stripping is simple with a utility blade designed for the purpose. Because CSST routes in continuous runs, there are fewer threaded joints and fewer potential leak points. It also performs well in areas with building movement or seismic activity. Always follow manufacturer instructions for bonding to the electrical system, supporting runs at the specified spacing, protecting tubing through studs, and pressure testing with air or nitrogen before service. For exterior or buried applications, use listed jacketed products and approved sleeving or conduit where required by code.
Tips for choosing CSST pipe and fittings:
- Size by total BTU demand and run length using the manufacturer’s tables to manage pressure drop.
- Use home-run manifolds for balanced flows, or trunk-and-branch with tees for straightforward layouts.
- Select black-jacket CSST for tougher environments and UV exposure.
- Pair brand-specific fittings with matching tubing to maintain listings and warranties.
- Plan transitions to rigid pipe at equipment with listed termination fittings and appliance connectors.