Entuit Thrive Balloon Retention (BR) Gastronomy Feeding Tube, 20 french diameter, 10 cm marked length, 20 mL balloon volume, sterile, silicone. Used with Entuit Start Initial Placement Gastronomy Set size small. The Entuit Thrive Balloon Retention (BR) Gastronomy Feeding Tube is a sterile device consisting of a silicone balloon, bi-lumen shaft, three-port funnel and bolster that allows for proper retention during enteral feeding, medication administration and decompression. The device contains one valve that allows for inflation and deflation of the silicone balloon.