The test tube port - window version is the central connection part used on the window edition - test tube array formicarium. 
 
You can buy the part independently and customize it with 16mm test tubes and accessories from our shop.
 
Key differences vs the original all-plastic test tube port:
 
The overall size of the port is much smaller and more refined.
It has clear glass on the front exposing the inside tunnels for complete visibility.
The back tube support or stand is much smaller and easier to use. 
Tubing openings are located on both sides, making the port easier to expand sideways. 
The tube openings have a rounded edge, making the insertion of the fitting much more accessible and secure. (the original all-plastic design has also received the update). 
 
Of course, the old port has its benefits; for example, it can fit two, three or four tubes; being all-plastic makes it more rugged and easier to clean; connection orientation may be better for specific setups etc. 
 
The window edition test tube port includes; a three-port array with glass, three silicone fittings for 16mm test tubes, two nest plugs for 9.5mm or 12.7 vinyl tubing based on your choice, and a rear stand for 16mm tubes.
 
Alternatively, you can add light protection, including a combination of a front glass plastic cover and three long black jackets 100mm long to cover 16mm diameter tubes. 
 
Approximate weight: 25 grams.