Stoppers

Stoppers, also known as bungs, are used to give an airtight seal to laboratory flasks and test tubes by fitting tightly inside the neck of the container and preventing material from spilling. Stoppers can be made of glass, cork, rubber, or silicone. They are typically designed with a conical shape, but straight, flanged, and tapered options are also available.

Stoppers are the preferred choice for many applications requiring a tighter seal or a greater degree of chemical resistance. They also provide a good seal when a solution needs to be shaken or mixed without spilling. Stoppers are generally cylindrical in shape and have a tapered bottom end. They may be marked with a stopper number or size on the top and bottom diameters of the stopper. Sizing can vary among manufacturers.

Stoppers are available in a solid design or with holes known as positions placed in the top. Positions allow easy access to the material contained in the sealed vessel by pipettes, tubing, or other equipment without full removal of the stopper.

What Types of Stoppers Are Available?
• Turnover stoppers have external serrations to create an excellent internal seal combined with a flexible turnover sleeve that folds down over the container’s neck to create a double seal
• Serum bottle or vial stoppers have two or three legs with external serrations or straight sides and a flanged top to create an airtight seal
• Straight bromobutyl plug-type stoppers provide a maximum seal for vials and serum bottles with a straight-wall glass finish
• Ultra-pure, straight bromobutyl plug-type stoppers provide high chemical purity and low gas permeability. They offer excellent performance during freeze drying processes such as lyophilization, where stoppers must remain stable during transfer and sublimination phases
• Silicone recessed septa stoppers are non-toxic and have external serrations to create an effective internal seal

226 – 240 of 822 results

226

Grainger Stopper Sz 14 75 mm BDia Black 0

The 16WC45 is a 16-inch diameter, 45-degree elbow made of carbon steel. It has a schedule 40 wall thickness and is rated for 150 psi working pressure at 100 degrees Fahrenheit. The elbow has beveled ends and is made in the USA. It conforms to ASTM A234 standards for carbon steel pipe fittings. The elbow is typically used in steam, water, air and other low pressure applications. It provides a cost-effective way to make 45 degree turns in piping systems.

Pricing & Availability

227

Grainger Stopper Sz 16 90 mm BDia Black 0

The Grainger 16WC64 is a Westward 3/8-inch drive socket set that includes both SAE and metric sockets. The set contains 22 sockets ranging in size from 5/16 inches to 3/4 inches and from 8mm to 19mm. The chrome vanadium sockets have a matte finish and feature a stamped size on each socket for easy identification. The set comes organized on a metal rail inside a durable plastic blow-molded case for storage and portability. This socket set is ideal for automotive and machinery applications.

Pricing & Availability

228

Grainger Rubber Rim Hole Plug 5/8 Rim

The Haltec Rubber Rim Hole Plug is a rubber plug designed to seal holes in wheel rims. It has a tapered design to fit different hole sizes and is made of durable rubber that resists cracking, weathering, and aging. The plugs come in a pack of 100 and fit hole sizes ranging from 5/16 inch to 3/4 inch. They can seal spoke holes, valve stem holes, and other rim holes to prevent air leaks. The plugs are easy to install by simply tapping into the hole with a hammer. Overall, the Haltec Rubber Rim Hole Plugs provide an effective and affordable way to seal holes in wheel rims.