Designed For Nitrogen Sampling. Inlet & Outlet Joints Are 18/9 Ball & Socket. 24/40 Or 29/42 Joint Connects Top with Bottle. Bottle Has 100mm Long Tube Below the 125ml Bulb. Coarse Porocity Frit is 12mm o.d. x 25mm Long. All Joints Have the Grease Free O-ring Seals (Except the 29/42 Joint).