PreciGenome offers air-tight reservoir kit, which allows pressurization of standard lab tubes for microfluidic applications. 
 
The kit includes a microfluidic adapter allows the use of Falcon tubes in microfluidic systems. It uses standard 1/4”-28 fittings, interfaced with any pressure source. It's so easy and convenient to build a reusable microfluidic reservoir system. 
 
Different versions are available: 1.5/2ml, 15 mL (Falcon tubes), 50 mL (Falcon tubes), and 100ml (or larger volume) bottles with GL45 thread.
 
This kit includes 
2 port version:
(1x) 15 mL Falcon/Nest tube microfluidic adapter with two 1/4"-28 threaded ports.
(2x) 15 mL Falcon/Nest tubes (tube brand is randomly picked up).
 
3 port version:
(1x) 15 mL Falcon/Nest tube microfluidic adapter with three1/4"-28 threaded ports.
(2x) 15 mL Falcon/Nest tubes (tube brand is randomly picked up).
 
Note: 
 1/4"-28 fittings or microfluidic tubing are NOT included.
 
Please find more information at the website.
https://www.precigenome.com/microfluidic-reservoir