Benefits of the #29 Valved Coil-less Laminar allows you to isolate your joint to swap out the receiving flask without loosing vacuum and having to expose your system to atmosphere. With this option, simply lower the PTFE valve and unscrew the GL cap to release the vacuum to change your flask.
Summit recommends all users of any and all glassware to operate inside a ventilated fume hood with sufficient blast shields to prevent injury in case of fatigued glass failure. Summit is not responsible or liable for the result of any failures from use, and/or loss of subsequent hardware contamination/failure with or without the result of material loss or damaged caused to surroundings. By purchasing our premiere lines of laboratory glassware the user is responsible to operate in the recommended environment safely. We recommend all users to operate in a legal and licensed facility where safety is the number 1 goal. #29 Valved Coil-less Laminar