Gas Connectors

By Jason Kossel — SEO & E-commerce Operations Manager

Reviewed: June 2026

Reliable Gas Connectors for Safe and Efficient Welding

Discover our high-performance collection of gas connectors at WeldingMart, designed to ensure secure and leak-free connections in all your welding and cutting applications. Our premium gas connectors are essential for professional welders and industrial operations, providing robust, reliable connections between gas hoses and equipment. Crafted from durable materials, these connectors are built to withstand the rigors of demanding work environments, ensuring long-lasting performance and safety. Whether you’re working with oxy-fuel systems, cutting, or brazing, our gas connectors offer easy installation and strong resistance to wear and corrosion. With various sizes and configurations available, you can find the perfect connectors to suit your specific needs. Upgrade your welding setup with our top-rated gas connectors from trusted brands like Harris Products, and experience the confidence of secure, efficient gas flow. Shop now at WeldingMart to equip yourself with the best gas connectors for optimal welding results.

Frequently Asked Questions

What is the difference between CGA and non-CGA gas connectors?

CGA (Compressed Gas Association) connectors follow a published standard that assigns specific thread sizes, handedness, and physical dimensions to each gas type, making it impossible to accidentally connect the wrong regulator to a cylinder. Non-CGA connectors appear in some imported or proprietary equipment. Always use CGA-compliant connectors on cylinders: the CGA standard is the safety backbone of the whole oxy-fuel gas system.

Why do fuel gas connectors have left-hand threads while oxygen connectors have right-hand threads?

Left-hand threads on fuel gas (acetylene, propane, etc.) connections are a deliberate anti-mix-up design. Standard right-hand-threaded oxygen fittings cannot be screwed into left-hand-threaded fuel gas ports, preventing the potentially fatal error of connecting oxygen directly into a fuel gas line. The fuel gas nut is also identified by a groove machined into the outside of the swivel nut.

Can I use a Teflon tape or thread sealant on gas connector threads?

No — do not use Teflon tape or pipe dope on oxygen connectors. Organic materials like PTFE tape can ignite violently in high-pressure oxygen. Fuel gas connections should also not use standard pipe dope; use only sealants specifically approved for the gas service (such as an oxygen-compatible thread sealant where a manufacturer specifies one). Most welding gas fittings are designed to seal metal-to-metal with a flat or tapered seat and do not need thread sealant.

How do I check a gas connector or fitting for leaks?

Apply an approved leak-detection solution (or diluted dish soap) to all connections after assembly and with gas pressure applied. Watch for bubbles — any bubble formation, even slow ones, indicates a leak that must be corrected before welding. Never use an open flame to check for gas leaks. Tighten fittings to hand-tight plus a quarter turn with a wrench; over-tightening can damage the seat or crack brass fittings.

What is a B-size (small) connector versus a standard full-size connector?

Compressed gas connectors come in multiple body sizes. The B-size (sometimes called 'B' or 'CGA B') is a smaller, lighter connector used on smaller cylinders and laboratory-type gas equipment, while the standard larger body is used on industrial cylinders. Both may share the same thread CGA designation number but differ in physical body diameter. Check the size on your existing regulator or ask your gas supplier which size your cylinders require.