Inlet & Outlet Joints Are 18/9 O-Ring Ball & Socket joints. 24/40 or 29/42 Joint Connect Top with Bottle. Bottles Has 100mm Long Tube Below the 125ml Bulb. Impinger Stem Is a Straight Tube, No Hold Up. All Joints Have the Grease Free O-ring Seal (Except the 29/42 Inner Joint).