Hands-Free Operation – No Taping or Holding Hoses: Stop taping or holding hoses while brazing. This Nitrogen Purge Boot creates a stable, hands-free seal on copper tubing. Internal O-rings lock in place, allowing you to focus on your torch. " Fits Multiple Tubing Sizes – 3/8" to 1-1/8" OD: Compatible with 3/8", 1/2", 5/8", 3/4", 7/8", and 1-1/8" OD copper tubing. Stepped cone design auto-seals based on tube size. Important: Tubing must be straight and deburred. NOT for 1/4" tubing. Keep pressure below 20 PSIG. Standard 1/4" fitting – No Special Installation: Connects directly to your existing nitrogen regulator hose via standard 1/4" SAE fitting. No adapters or modifications needed. Setup takes seconds – simply attach and you're ready to braze. Precision O-Rings – Durable & Not Replaceable: Multiple precision fit internal O-rings create an airtight seal. Note: O-rings are not user-replaceable due to precision fit." Low Pressure Operation – Keep Below 20 PSIG: Designed for low-pressure nitrogen flow. Never exceed 20 PSIG. Recommended range: 5–15 PSIG for routine brazing. Proper pressure prevents oxidation, protects seals, and ensures consistent performance.