Midget Glassware & Accessories (Method 6) - Midget glass impingers feature unground double O-Ring 24/40 taper joint and 12/5 O-Ring ball joints. Bottle capacity is 40ml. The Insulated Sample Tray with Drain Valve (MSB-1) can hold a Midget Glassware Set (MGN-CGS) and two nontoxic Ice Packs (ICE-20). The ice packs allow quick turn around. At the end of the run simply remove the ice packs and drain the water before purging. Set includes impingers (plain and orifice), U-Tubes, Connectors and Clamps.