Microscale photochemical reactor with internally threaded connections both top and bottom of head

Top is #15 Ace-Thred that accepts 12.5-14 mm O.D. tubes such as 89075-462 finger condenser; bottom is #25 Ace-Thred that accepts a 24 mm O.D. quartz or glass (borosilicate) reactor tube for photolysis experiments. Complete item consists of head, #15 and #25 nylon bushings with O-Rings, cap stopper with cap and O-Ring, finger condenser, and either quartz or glass 25 x 120 mm reactor tube.