All pieces of these kits are made in our ISO 9001 approved Factories and meet the strict quality requirements of ASTM E438, Type 1, Class A, the North American Quality & Safety Standard that Amazon requires of it's sellers. Kit Includes: 1-1000ml Round Bottom Flask, 2- Neck, Heavy Wall, 24/40; 1-1000ml Round Bottom Flask, Single-Neck, Heavy Wall, 24/40; 1-500ml Round Bottom Flask, 3-Neck, Heavy Wall, 24/40; 1-250ml Round Bottom Flask, 2-Neck, Heavy Wall, 24/40; 1-Graham Condenser, 300mm, 24/40; 1-Liebig Condenser, 300mm, 24/40; 1-Vigreux Distillation Column, 400mm, 24/40; 1-Allihn Condenser, 300mm, 24/40; 1-Separatory Funnel, 250ml with 24/40 top & bottom joints; 1-Claisen Adapter, 24/40; 1 - Three-way Thermometer Adapter w/ O-ring & Screw cap, 24/40; 1-Vacuum Take-off Adapter, 24/40, 105° bend; 4-Penny Head SOLID Glass Stoppers, 24/40, 10-Plastic Keck Clamps, 24/40. All Pieces are made of Low Expansion Borosilicate Glass and meets ASTM Specification E438, Type 1, Class A, the North American Quality & Safety Standard that Amazon requires of its sellers; the Chinese manufacturers do NOT meet these standards
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