Idex Bottle Cap Plugs and Adapters

Bottle Cap Plugs and Adapters

Use the A-626 Bottle Cap Plug to seal the third “tapered” luer hole found in most Upchurch Scientific® Bottle Caps. Or, use the A-628 Plug to seal any unused 1/16” or 1/8” bottle cap holes. Alternatively, try the A-627 or A-629 Filter Bottle Cap Plug to cap an unused hole in your bottle cap. The 20 μm stainless steel frit in these products prevents foreign matter from contaminating your solvent while leaving the bottle open to the atmosphere, thus allowing fluid to be pulled out without creating a vacuum (generally not used with sparging applications). All plug bodies are manufactured from ultrahigh molecular weight polyethylene (UHMWPE).


Our P-600 Bottle Cap Adapter is designed to allow the use of 1/32” OD tubing with our caps. Just insert the Adapter into a tubing cap hole, then connect your 1/32” OD tubing with our F-126S or F-126H MicroTight® Fitting.


Application NOTE:

  • A self-regulating sparging system can help reduce helium consumption and improve pump performance. Set this up by pressing your tubing through the appropriate holes in your bottle cap and attaching each line to a filter. Sparge your mobile phase with an inert gas (preferably helium) for 15–20 minutes. Then reduce the outlet pressure of the sparging gas to a maximum of 5 psi (0.34 bar) and insert a plug (A-626 or A-628) into the remaining port of the cap. The sparging gas will shut off once the incoming pressure equals the pressure inside the reservoir. As the mobile phase is consumed and the internal pressure lowers, sparging gas will enter to keep the system pressurized and degassed. Please Note: If gas leaks while pressurizing the bottle, try removing the sealing ring from the bottle, as it sometimes interferes with the sealing of Upchurch Scientific bottle caps.
  • One concern with sparging systems is the possibility of solvent backing up the sparging inlet line. This can occur if the gas tank completely evacuates with the regulating valves open, creating a vacuum in the tubing. Solvent backup may damage sparging system components and cause crosscontamination of mobile phase reservoirs. To help prevent solvent backup, install the CV-3010 Inline Check Valve (page 151) along the tubing line that runs between the gas supply and the solvent bottle.
  • For a more efficient degassing system, please see the Systec® HPLC Vacuum Degassing Systems.
  • Please see the Quick-Stop Luer Check Valve for another solvent inlet Application Note.


Serial Number



Bottle Cap Plug for Luer Hole


Bottle Cap Plug with w/Stainless Steel Frit


Bottle Cap Plug for 1/8" OD


Bottle Cap Plug with 20µm w/Stainless Steel Frit