This product is a replacement part for the Jacketed Reactor Material Flask Series.  The 1L borosilicate flask is for the 5L Reactor - 2L is for the 10L Reactor - 5L flask fits the 20L, 50L, and 100L Reactors.  JR MATERIAL FLASK SpecificationsCapacity500ML1L5LTop Connection 24/40 Female29/32 Female2x 29/32 1x 34/36 FemaleBottom Connection 24/40 Male40/38 MaleS50/20 MaleReactor Size5L10L20L, 50L, 100LDimensions LxWxH5" x 3" x 17"4" x 2" x 17"7" x 7" x 21"  For Technical Support, Questions, or Other Issues Please Email or Call Us!