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Bel-Art Scienceware 420400000 Polypropylene Replacement Stopcock, For Vacuum Desiccator

2.0 out of 5 stars 3 customer reviews

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  • Stopcock to control airflow in a vacuum desiccator, for use with Bel-Art Scienceware desiccator models F42025, F42020, F42010, F42012, F42022 and F42027
  • Body constructed of polypropylene for strength, thermal performance, and solvent resistance, and plug and washer of polytetrafluoroethylene (PTFE) for strength and resistance to moisture and temperature changes
  • Bright red handle for quickly determining its position
  • Taper fits on desiccator port to provide easy, leak-proof turning
  • Can be cleaned with a soft cloth and laboratory cleanser

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Product Description

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.


Product Information

Technical Details

Brand Name Bel-Art Products
Item Weight 0.2 ounces
Product Dimensions 1.8 x 1.2 x 0.6 inches
Item model number 420400000
Material Type Polypropylene, Polytetrafluoroethylene (PTFE)
Number of Items 1
Manufacturer Part Number 420400000

Additional Information

ASIN B002VBW9V4
Customer Reviews
2.0 out of 5 stars 3 customer reviews

2.0 out of 5 stars
Best Sellers Rank #242,872 in Office Products (See top 100)
#21 in Industrial & Scientific > Lab & Scientific Products > Lab Instruments & Equipment > Evaporation & Drying Equipment > Desiccators & Accessories > Desiccator Accessories
Shipping Weight 0.2 ounces (View shipping rates and policies)
Domestic Shipping Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available November 3, 2009

Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Technical Details

  • Brand Name: Bel-Art Products
  • Part Number: 420400000
  • Material Type: Polypropylene, Polytetrafluoroethylene (PTFE)
  • Number of Items: 1
  • Item Package Quantity: 1

Customer Questions & Answers

Customer Reviews

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Top Customer Reviews

By Rick Dotson 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.
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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.
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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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