Macro
 
Types 1, 3, 9 & 18 Rectangular with small screw cap (ST)
Closed with screw cap, with or without septum aperture.
The outside diameter of the cap is less than the cross-section of the cell
Septum aperture diameter - 6mm.
ST/C closed cap 
ST/S septum cap to allow filling, extraction or gas flow with syringe needle(s) through silicone seal which has a PTFE face