What is the tube size? My 1/4" ID tube will not fit.

Try 5/16" ID Silicone tubing. 3/8" Tygon might work as well.

is anyone positive (Not "pretty sure") what size stopper works with this flask?

The flask opening is one and three-eighths inch in diameter. Do a internet search for standard stopper sizes. A stopper that is one and one-half inches in diameter at the widest end should be adequate.

What size stopper fits this flask?

I'm pretty sure it was a size 10

Hey Carlton. Where I found my "Stopper" was a Local place that supplies equip to the Home Beer Brewer. I will looking for something that was "Food" Grade.

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United Scientific FG5340-1000 Borosilicate Glass Heavy Wall Filtering Flask, Bolt Neck with Tubulation, 1000ml Capacity

Product ID: 456103790

Details

Bottom shape
Round
Brand
United
Capacity
1000
Graduation interval
1000
Material
Borosilicate

🔒Autoclavable for sterile reuse

🔥1000mL heavy-duty capacity

🧪Borosilicate glass - chemical & thermal resistant

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VT26859

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Description

🧪 Elevate your lab game with durability and precision!

AUTOCLAVABLE DESIGN - Sterilize with confidence for repeated lab use
PRECISION GRADUATIONS - 50mL intervals for accurate measurement and monitoring
ROBUST 1000 M L CAPACITY - Generous volume for high-demand filtration tasks
BOLT NECK WITH TUBULATION - Secure connections minimize leaks and maximize efficiency
PREMIUM BOROSILICATE GLASS - Engineered for superior thermal shock & chemical resistance

The United Scientific FG5340-1000 is a 1000mL borosilicate glass filtering flask featuring a heavy wall design for enhanced durability. Its bolt neck with tubulation ensures secure connections, while the autoclavable material supports repeated sterilization. Graduated in 50mL increments, it combines thermal shock resistance and chemical durability, making it an essential tool for professional laboratory filtration.

Specifications

ASIN	B00ES3R29M
Bottom Shape	Round
Brand Name	United Scientific
Capacity	1000 Milliliters
Customer Reviews	4.6 4.6 out of 5 stars (86)
Graduation Interval	1000 Milliliters
Manufacturer	United Scientific Supplies, Inc.
Material Type	Borosilicate Glass
Model Number	FG5340-1000
Part Number	FG5340-1000
Specification Met	ASTM E960
UPC	306032538109 306032538086 840287200225 306032538079
Unit Count	1 Count

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