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Features & Details

⚙️ NOZZLE CONFIG

Dual ports seamlessly. Features an upper vacuum connection and a lower multi-purpose drain/vent tap.

🧪 GLASS MATERIAL

Heavy-wall Boro 3.3 borosilicate glass natively. It features double-reinforced joints to withstand intense mechanical hose stress.

🔄 UNIQUE FEATURE

Switch between vacuum and gravity modes instantly. You never need to reconfigure or remove your tubing setups.

📏 CAPACITIES

Available in 7 practical sizes. Ranges from a compact 125ml (4.2 oz) up to a massive 10000ml (2.6 gal) production vessel.

About this item

Product specification

Attribute

Product Specifications

General Information & Material

Brand Name

Huaou (Distributed by Xin Tester)

Material Base

Heavy-Wall Borosilicate Glass (Boro 3.3)

Manufacturing Standard

Complies with global ASTM glass dimensional standards

Design & Port Configuration

Body Shape

Erlenmeyer (Conical) Flask with flat base for stability

Upper Nozzle Port

Primary vacuum connection (Positioned safely above liquid level)

Lower Nozzle Port

Multi-purpose: Controlled drain / Vent / Instrument tap

Joint Reinforcement

Thickened glass walls at both nozzle attachment points

Capacity & Thermal Limits

Available Sizes

125ml (4.2oz), 250ml (8.5oz), 500ml (16.9oz), 1000ml (33.8oz)
2500ml (84.5oz), 5000ml (1.3 gal), 10000ml (2.6 gal)

Temperature Tolerance

Max Peak: ~500°C (932°F)
Continuous: ≤450°C (842°F)
Thermal Shock ΔT: ≤200°C (392°F)

Sterilization

Autoclavable safely at 121°C (250°F) repeatedly

Dual Nozzle Filter Flask. Reliable lab glassware designed for everyday bench use. Built with quality borosilicate glass and precision manufacturing to handle routine lab workflows without fuss. A practical addition to any lab setup.

Maximum Versatility for Modern Filtration Workflows

Laboratory filtration demands ultimate flexibility every single day. A dual nozzle filter flask provides exactly that capability. Standard flasks only offer a single upper connection point natively. This limits your experimental extraction configurations severely. Our dual-port vessel changes how you manage liquid flow completely. We manufacture this vessel using premium heavy-wall Boro 3.3 borosilicate glass. This high-grade material meets stringent global laboratory requirements easily.

You can verify official glass safety testing standards directly at the ASTM International root hub. It bridges the gap between basic student equipment and premium research glassware. It solves complex pressure-equalization problems without buying expensive external stopcock adapters. Pair this premium flask with our complete Lab Glassware collection. You can build a highly flexible and safe filtration station today.

1Two Independent Glass Ports

Having two connection points expands your daily workflow options immediately. The upper nozzle acts as your primary vacuum source securely. It stays safely above the collected liquid level at all times. The lower nozzle functions as a highly controlled drain port. You can also use it as an atmospheric vent easily. It serves as a great secondary vacuum takeoff when needed.

2Heavy-Wall Reinforcement

Dual-port configurations experience additional mechanical stress during vacuum operation. Pulling tubing creates heavy tension on the delicate glass joints constantly. We designed both nozzle attachment points with thickened walls natively. This heavy-wall reinforcement handles increased clamping forces safely. It resists snapping even when both ports carry heavy rubber hoses simultaneously.

3Instant Mode Switching

Complex washing sequences require rapid pressure changes constantly. You can close the lower port to run standard vacuum filtration. Open it to switch back to gravity drainage instantly. You never need to disconnect hoses or move the heavy flask. It keeps your workstation clean and prevents accidental solvent spills completely.

Core Capabilities of the Vacuum Flask

⚖️ 7 Capacity Options

We offer practical sizes for every throughput tier. Choose from compact 125ml (4.2 oz) micro-scale units up to massive 10L (2.6 gal) production vessels.

Use Cases

Autoclavable & Sterile Filtration & Separation Heavy Duty Design School Science Labs

FAQs

Q1: What can I actually do with the second (lower) nozzle that I cannot do with a single-nozzle flask?

A1: Four distinct use cases open up: (1) **Controlled gravity drain** — close the lower nozzle during vacuum filtration, then open it afterward to drain residual filtrate without tilting or disconnecting the vacuum line; (2) **Fraction collection manifold** — connect a multi-way valve to the lower port to split filtrate into sequential collection vessels under continuous vacuum; (3) **Inline instrumentation** — attach a flow sensor, pH probe, or turbidity meter to monitor filtrate quality in real-time without breaking vacuum; (4) **Pressure equalization vent** — briefly open the lower port to admit air when switching between vacuum and atmospheric-pressure wash steps without removing the Buchner funnel.

Q2: Does having two nozzles make the flask weaker or more prone to breaking?

A2: Not if manufactured correctly. Cheap dual-nozzle flasks often crack precisely because the manufacturer uses the same wall thickness as their single-nozzle model despite adding a second stress-concentration point. Huaou addresses this by thickening the glass around both nozzle joints (visible as a slightly bulged appearance at each joint base) and using annealed Boro 3.3 composition that distributes clamping stress across a wider area. In practice, these dual-reinforced flasks survive Buchner clamp torque as well as or better than many single-noise competitors.

Q3: Should I use the upper or lower nozzle for the main vacuum connection?

A3: Always use the **upper nozzle** as the primary vacuum connection. This positions the vacuum inlet above the maximum realistic liquid level in the flask, which eliminates the possibility of drawing liquid into your vacuum pump (a costly and time-consuming contamination event). Reserve the lower nozzle for the auxiliary functions described above: draining, fraction collection, instrument tapping, or venting. If you absolutely must use the lower nozzle as a secondary vacuum boost (for very viscous filtrates that resist flow through a single port), install a trap flask in-line before the pump as a safeguard.

Q4: Can I plug the lower nozzle if I only need single-nozzle functionality right now?

A4: Yes. Several options exist: (1) Insert a ground-glass stopper matching the nozzle taper to create a sealed temporary single-nozzle configuration; (2) Attach a rubber septum cap for needle-access-only use; (3) Connect a short length of tubing with an in-line pinch-clamp or stopcock that you keep closed during normal operation. The beauty of the dual-nozzle design is that it never forces you to use both ports — the second nozzle sits dormant until you need it, with zero performance penalty compared to a single-nozzle flask of the same capacity.

Dual Nozzle Filter Flask, Heavy-Wall Borosilicate Vacuum Glassware (125ml-10L) by Xin Tester

Price range: $13.93 through $181.66

Extra 5% Off with code: welcome5

Capacity

Clear

6–12 Month Warranty

Repair & Refund support available for most products.

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Buyer responsible for local import fees.

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