Fabricated from borosilicate glass with walls tapered inward toward bottom to allow operation with smaller volumes

250 mL size supplied with #25 Ace-Thred center neck and three standard taper 14/20 side necks. All other capacities supplied with #36 Ace-Thred center neck and three standard taper 24/40 side necks. Use bushing and o-ring in #25 Ace-Thred, bushing and o-ring in #36 Ace-Thred to form a leak-tight compression seal with all. Horns with groove and slide adapters 25 mm and 35 mm. Stated capacity is without horn. Bushings and o-rings sold separately.