Rugged cylindrical jacketed reaction flask with Duran, flat, ground flange and o-ring groove. Various bottom outlet options are available (see details below). For use with 6517 quick release clamp. Jacket inlet/outlets are available with either tangentially sealed o-ring ball joints or with Ace-Thred connections. Flask supplied with CAPFE o-ring. 10L and larger flasks (only) have capacity reference graduations.