Thmxit 3/4" CSST Gas Line 100FT — Flexible 304 Stainless Tubing with Yellow UV-Resistant Jacket & 3/4" Brass Fittings

Thmxit 100FT 3/4" CSST is a corrugated stainless steel flexible gas line designed for propane and natural gas applications, supplied with 3/4" male brass fittings for straightforward connections.

This 100-foot roll of 3/4" corrugated stainless steel tubing (CSST) from Thmxit combines a flexible annular design with a UV-resistant yellow polyethylene jacket and 304 stainless core. It’s intended for use in gas distribution runs where flexibility, corrosion resistance, and long runs are needed. The hose measures approximately 0.66" (17 mm) inner diameter and 0.8" (22 mm) outer diameter, and arrives fitted with male brass connectors on both ends. It is CSA tested to meet North American standards, but it should be installed according to local codes and by qualified professionals.

How does this CSST hose make installations easier?

The corrugated profile and flexible stainless core let you bend and route the line without many rigid fittings, reducing time and potential leak points. The pre-attached male brass fittings simplify connections to standard threaded gas fittings. Because the inner diameter remains consistent when bent, flow performance is preserved.

• 100-foot continuous length for long runs or staging
• Annular corrugated design for ease of bending
• Pre-installed 3/4" male brass fittings on both ends
• Consistent 0.66" inner diameter maintains gas flow

Is this safe for buried or underground gas lines?

The Thmxit CSST is not meant to be buried directly in the earth. If you must route the line underground, local codes require placing the CSST inside a non-metallic, watertight conduit that is at least 1/2" larger than the pipe’s outer diameter to prevent damage and moisture intrusion.

• Do not bury CSST directly in soil without conduit
• Use non-metallic watertight conduit 0.5" larger than pipe OD
• Follow local plumbing and gas codes for underground runs
• Consult a licensed installer for safety and code compliance

Which appliances and systems is this 3/4" line suitable for?

This size is commonly used for higher-flow applications such as ranges, water heaters, generators, fire pits, and supply mains to branch lines. The robust 3/4" diameter supports both natural gas and propane service when sized and installed correctly by a professional.

• Gas ranges and cooktops, water heaters, and dryers (where permitted)
• Outdoor grills, fire pits, and patio heaters (with proper termination)
• Generator and compressor supply lines
• Main distribution runs feeding smaller branch lines

What materials and testing back this product’s longevity?

The tubing uses SUS304 stainless steel for corrosion resistance with a UV-stabilized yellow polyethylene outer jacket to protect against sunlight exposure. Thmxit supplies 100% male brass fittings for durable threaded connections, and the assembly has been CSA tested to meet applicable North American safety standards.

• 304 stainless steel inner corrugated tubing resists rust
• 0.079" UV-resistant yellow polyethylene outer jacket
• Brass male fittings for reliable threaded connections
• CSA-tested to North American standards

Who this product is for: The Thmxit 100FT 3/4" CSST gas line is aimed at contractors, plumbers, and experienced DIYers who need a long, flexible run for medium- to high-flow gas applications. It’s a practical choice when bending around obstacles, reducing fitting count, or creating a single continuous supply run is preferred. Always have a licensed professional verify sizing, local code compliance, and perform the final installation and pressure testing.