A unique glass adapter, offset and angled approximately 10° for use with multi-neck flasks. Thermometers or bleed tubes are angled into the bottom of a flask. A vacuum-tight seal is effected with the compression cap and Viton* o-ring to allow adjustable immersion of thermometers, etc. Cap is suitable for use to 200°C. Supplied complete with one size 010 FKM o-ring and one 410119 cap.