Kinchoix CSST 3/4" Corrugated Stainless Steel Gas Tubing 70 ft — 150,000 BTU, Brass Fittings

Kinchoix CSST 70 ft 3/4" is a corrugated stainless-steel flexible gas line designed to deliver up to 150,000 BTU/hour for natural gas or propane applications while simplifying routing and reducing fittings.

This 70-foot, 3/4" corrugated stainless-steel tubing (CSST) from Kinchoix combines a corrosion-resistant SUS304 inner tube with a UV-resistant yellow polyethylene jacket and 3/4" male brass fittings on both ends. It’s intended as a flexible supply line for indoor and outdoor gas fixtures—helping installers and homeowners snake gas service through attics, basements, walls, and underground runs with fewer connection points than rigid piping.

How much gas flow can this 3/4" CSST handle?

The Kinchoix 3/4" CSST has a 16mm (0.625") inner diameter and a 20mm (0.787") outer diameter, sized to carry substantial BTU loads. In practical terms it supports up to approximately 150,000 BTU/hour, making it suitable for many residential and light-commercial appliances.

• Inner diameter: 16mm (0.625") — supports high flow rates
• Rated flow: up to ~150,000 BTU/hour
• Length: 70 feet for long runs without many joints
• Suitable for larger appliances like ranges, heaters, and grills

Where can I use this flexible gas tubing safely?

Kinchoix CSST is designed for both indoor and outdoor gas connections when installed per local codes. It can be routed through attics, basements, behind drywall, embedded in concrete, or buried underground where permitted, offering flexibility for diverse installations.

• Indoor: behind walls and in utility rooms for ranges, water heaters, furnaces
• Outdoor: grills and fire pits when routed and protected as required
• Buried or embedded: suitable for underground or encased applications per code
• Good for renovation work where routing around obstacles is needed

What materials and fittings are included, and how do they improve durability?

The tubing uses SUS304 stainless steel inside for corrosion resistance and a 0.079" yellow polyethylene jacket for UV protection. Each end is fitted with a 3/4" male brass fitting with standard pipe threads to make connections straightforward and secure.

• Inner tube: SUS304 stainless steel — resists corrosion
• Outer jacket: 0.079" UV-resistant yellow polyethylene — weather protection
• Fittings: 3/4" male brass — standard threads for easy hookups
• One-piece molded construction reduces intermediate joints

How does flexibility affect installation and leak risk?

Corrugated stainless steel tubing bends easily to follow building framing and navigate corners, which reduces the need for extra joints and fittings. Fewer connections mean fewer potential leak points, and the one-piece design helps maintain integrity when cut to length and properly terminated.

• Flexible corrugated design for tight or awkward routing
• Reduce number of fittings by bending instead of adding elbows
• Cut-to-length convenience — trim and terminate as needed
• Follow all local codes and use approved fittings to ensure safety

Who is this for? Installers, contractors, and informed homeowners who need a long, flexible gas supply capable of handling larger BTU loads will find the Kinchoix 70 ft 3/4" CSST useful. It’s especially helpful on remodels or new installations where routing a continuous, corrosion-resistant line with fewer joints speeds work and reduces potential leak paths. Always confirm compatibility with your appliances and follow applicable local plumbing and gas codes. If a connector fitting is missing at delivery, Kinchoix offers free replacement support.