This drying tower fits between the vacuum line and pump oil trap. This trap has a sealed-in extra coarse fritted disc for support of KOH, and is 50 mm I.D. x 250 mm effective length with both ends having #20 O-ring joints. The lower adapter has a #20 O-ring joint with a 1" O.D. tubulation for connection to flexible vacuum tubing. The complete item consists of one KOH tower, one AF-0300-51 lower tubing adapter, one AF-0300-14 90° connection adapter, two CG-150-06 #35 stainless steel clamps and two CG-305-214 #214 Viton® O-rings.