This is an update to the custom adapter that we created. STL file wasn't downloading properly from the last uploaded file. The slots at the top that connect into the 3M Airmate PAPR Hood was found to be too long, allowing for a 40% loss of airflow. Made suggested changes to reduce the loss of airflow and to allow for a better fit between the hose and the hood. We have an overabundance of 3M Airmate PAPR hoods and not enough hoses, and we have a lot of Sentinel PAPR tubes. This adapter will allow a Sentinel PAPR Tube to connect to a 3M Airmate PAPR Hood. Printed in PLA which can be sterilized properly. Suggest using PLA, or PETG depending on your climate as extreme heat will cause PLA to warp slowly