Jacketed, spherical reaction flask with Duran flat flange and o-ring groove, for use with our 6517 Quick Release clamp. Bottom outlet features an Easy-Action plug controlling the 28/15 o-ring ball joint outlet. Jacket inlet/outlets are available with either tangentially sealed o-ring ball joints with FETFE o-rings or with #11 Ace-Thred connections for use with 3/8in ID tubing. Flask is supplied with a CAPFE o-ring for the flange, Chemraz o-rings for the drain. See our 6528 and 6529 series reaction heads. 12L versions (only) graduated.