Drum and bottle connectors
BQ45GL
BQ45GL is a screw cap for GL45 laboratory bottles with a quick disconnect coupling or a connection fitting built in. A hydrophobic vent lets air back in while liquid is drawn off, and a hose barb on the underside holds the dip tube. The caps are moulded in blue HDPE, the valved versions are sealed with EPDM and the operating range is 0 to 49 °C.
- 3 items
- 1 manufacturer
- Net prices plus VAT
Buying guide
How to choose BQ45GL
What matters when choosing: properties, comparison and typical applications.
Selection criteria
| Criterion | Version | Note |
|---|---|---|
| Bottle thread | GL45 | Fits common media and lab bottles with a GL45 neck. |
| Connection | PMC coupling body with valve, PMC insert with valve, 1/4" fitting without valve | With a valve, the bottle stays closed when disconnected. |
| Material | HDPE, blue | Lightweight, chemically robust cap for daily lab use. |
| Seal | EPDM (valved versions), polyethylene gasket | The cap seals to the bottle even without an extra sealing ring. |
| Temperature | 0 to 49 °C | For room temperature and mildly tempered media. |
Frequently asked questions
- What is the vent in the cap for?
- While liquid is drawn off, air flows back in through the hydrophobic membrane so no vacuum builds up in the bottle. Liquid cannot pass through the membrane.
- Do I need an additional sealing ring?
- No. The cap is designed to seal reliably on the bottle with its polyethylene gasket, without a separate sealing ring.
- Coupling body, insert or fitting?
- The PMC coupling body and insert both contain a valve and shut on disconnection, so the bottle can be swapped without drips. The 1/4" fitting has no valve and is meant for permanent connections.
- How is the dip tube attached?
- A hose barb on the underside of the cap takes the dip tube, which then reaches down to the bottom of the bottle.