according to Claisen with Liebig cooler without vacuum-tip

                                             coating length in mm     SGJ male ground

20.630.20                      200                                                    2 x 14

20.630.30                      300                                                    2 x 14

20.634.30                      300                                                    2 x 14 + 2 x 29

20.634.40                      400                                                    2 x 14 + 2 x 29

Qty=1