The B&B Pronto Purge was developed for increased efficiency of large diameter pipe. We recommend the Pronto system in pipe over 8″, though major time and gas savings occur the bigger the pipe gets. The “thru-bore” umbilical section displaces even more oxygen than other inflatable systems. Additional features like a glow in the dark center line that helps alignment, sewn in pull handles for bag extraction and a double hose (first hose inflates, second hose increases Argon flow rate, lowering purging times).