Vacuum Flask Stoppers

No. 1 Vacuum Flask Stopper

No. 1 Vacuum Flask Stopper

Model: GWA-501
Price: $5.00
No. 2 Vacuum Flask Stopper

No. 2 Vacuum Flask Stopper

Model: GWA-502
Price: $6.00
No. 4 Vacuum Flask Stopper

No. 4 Vacuum Flask Stopper

Model: GWA-504
Price: $9.00

Vacuum Flask Stoppers are used for deairing operations. These stoppers will fit pycnometer flasks like Volumetric Flasks or the No. 4 stopper will also fit Iodine Flasks. All stoppers have single holes with barbed fittings for connection to 3/8in vacuum tubing.

GWA-501 No. 1 Stopper will fit 250ml Volumetric Flasks

GWA-502 No. 2 Stopper will fit 500ml Volumetric Flasks

GWA-503 No. 4 Stopper will fit 1,000ml Volumetric Flasks and all Iodine Flasks


  • Forms a leak-proof seal for efficient deairing
  • Metal barbed fitting for quick connection of vacuum tubing

Included Items:

  • Vacuum Flask Stopper (No. 1, No. 2, or No. 4)
Estimated Shipping Weight 0.5lb (0.23kg)

Enter your name, email, and questions below and we will reply during business hours (8am - 5pm EST, Monday through Friday).

Estimated Shipping Weight 0.5lb (0.23kg)
Meets Standard(s):
Customers who purchased this item also purchased
Volumetric Flasks
Starting at $16.50
Models: SG-100, SG-250, SG-500, SG-1000
Soil Hydrometers
Starting at $26.00
Models: SA-1, SA-1T, SA-2, SA-2T
Stainless Steel Straightedges
Models: HMA-135, HMA-135A
Sand Grain Size Chart
Model: HM-510
Sand Gauge
Model: HM-513
Sodium Hexametaphosphate (SHMP)
Models: SA-20, SA-20C
Sedimentation Cylinder
Model: SA-5
Porcelain Evaporating Dishes
Models: MA-275, MA-276, MA-277, MA-278
Digital Calipers
Starting at $218.00
Models: TSA-271, TSA-268, TSA-270