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Your cart is empty.The Bel-Art Scienceware 420400000 replacement stopcock is to control airflow into and out of a vacuum desiccator, for use with Bel-Art Scienceware desiccator models F42025, F42020, F42010, F42012, F42022 and F42027. The body of the stopcock is constructed of polypropylene for strength, thermal performance, and solvent resistance, and the plug and washer are constructed of polytetrafluroethylene (PTFE) for strength and resistance to moisture and temperature changes. The stopcock's taper fits on the desiccator port to provide easy, leak-proof turning. This item can be cleaned using a soft cloth and standard laboratory cleanser. The stopcock's plug has three positions: vacuum draw, shut-off, and vacuum release. Desiccators are sealable containers used to remove water from a sample, or to preserve moisture-sensitive electronics or lab consumables, typically in laboratory, electronic, and aerospace applications. Desiccators are often used with desiccants, which are drying agents such as silica gel or activated charcoal placed under a removable platform. Standard desiccators are typically lidded jars used with a desiccant. Vacuum desiccators have a stopcock that allows air evacuation from the desiccator. Gas purge desiccators use a gas port to introduce nitrogen or other gasses, creating a controlled environment. Vacuum and gas purge desiccators may also be used with desiccants. Many desiccators are used with vacuum grease, which helps create a seal.Bel-Art Products manufactures scientific products, including labware, testing equipment, and safety supplies, under the Bel-Art and Scienceware brands. The company, founded in 1946, is headquartered in Wayne, NJ. Research, industrial and healthcare professionals rely on SP Scienceware for their sample handling needs. Sold worldwide, Bel-Art and H-B Instrument brand laboratory supplies include over 5,000 items from safety wash bottles to fume hoods, thermometers, racks, desiccators, hydrometers, ice buckets, scoops and spoons. Custom calibration services, plastic molding, specialty coatings and wire manufacturing are also available. Wilmad-LabGlass brand laboratory glassware complements Bel-Art and H-B Instrument with over 7000 items including NMR and EPR consumables and specialty glassware, as well as custom fabrication for individual glassware, glass repair services and OEM glass parts. SP Scienceware is a division of Warminster, PA based SP Industries which also include SP Scientific laboratory, thermal management, and pharmaceutical production equipment and SP Ableware aids for daily living.
Camp447
Reviewed in the United States on July 21, 2013
has a slow leak, holds full vac for maybe 20 minutes, with a ~2 hour bleed to atmospheric pressure. it also takes much longer to pull to full vac through the tiny valve, which was clogged with milling burrs to begin with. overpriced for what is obviously cheaply manufactured. had much better luck with 15 dollars and the ace hardware plumbing section.its alright for what it is, if i only needed it to hook up a vac hose no big deal. on the other hand if you want it to do what its intended, and hold negative pressure, find another part.
Rik Hanssen
Reviewed in the United States on December 7, 2013
I really wanted to give this Stopcock a Two Star rating but I gave it a three because mine lasted for a year before I had to replace mine and i pretty much use it on a weekly basis.The trick I found to using these, is to keep the bottom nut tightened while under full vacuum pressure.But what happens over time is the "thin" plastic threads eventually stripped.I REALLY wish they'd improve this item by making it more solid. Especially the threaded end bottom piece.
D. Sanchez
Reviewed in the United States on January 15, 2013
i just recieved a Bel-Art Scienceware 420430000 Polycarbonate/PTFE Vacuum Chamber with ABS Plastic Plate, 9" Diameter x 6-1/4" Height and the valve broke on both the stopper end, as well as the connecter end upon the first use when hooked up to a 2 stage 5cfm pump. the only way i can achieve a vacuum level of -29hg is to have this loud pump constantly running. this thing literally broke on the first use and you want $40 outta me for a new one? this has got to be a joke.
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