Flasks Filtering Bolt Neck, with Tubulation
Product Code : EL-GF-10222
Quick answer: The Flasks Filtering Bolt Neck, with Tubulation is a borosilicate glass filtering flask blown in special moulds, with a bolt-neck finish designed for strength and a secure stopper fit, plus a side-arm tubulation for the vacuum line, available from 100ml to 5000ml.
| Specification | Detail |
|---|---|
| Material | Borosilicate glass |
| Forming method | Blown in special moulds |
| Neck design | Bolt-neck finish for strength and stopper fit |
| Fitting | Tubulation (side-arm) for vacuum connection |
| Capacities | 100ml, 250ml, 500ml, 1000ml, 2000ml, 5000ml |
Why a Bolt-Neck Finish on a Filtering Flask
Being blown in special moulds gives this flask a bolt-neck finish specifically engineered for strength at the mouth and for a good, secure stopper fit — both important where the flask is regularly stoppered and de-stoppered under vacuum. The tubulation gives a dedicated side-arm connection point for the vacuum line, keeping the main neck free for the funnel.
Frequently Asked Questions
What does "bolt neck" mean for this flask?
It refers to a neck finish, produced by mould-blowing, that is designed for strength and to ensure a good stopper fit.
What is the tubulation used for?
The tubulation is a side-arm fitting used to connect the vacuum line during filtration.
What capacities are available?
Capacities of 100ml, 250ml, 500ml, 1000ml, 2000ml and 5000ml are available.
Related Products
Explore more filtering flasks in the Glass Flask range, including the Heavy Wall Filter Flask and Flask Filter with Glass Connector.
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Last updated: September 2026.
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