The stainless steel threaded rods are used are used to string the modules together. In turn they fasten to the brass headers. The M8 rods screw into the brass end caps.
Stainless steel M8 nuts are used to compress all the component modules together.
In the factory we tighten with a torque wrench to 7.5 newton, but it is not complicated. Tighten securely to effect a even seal across all four rods. Nuts and plastic 'nut' covers are available separately (should a smaller qty be required, enquire at Intaeco sales).
Stainless steel threaded rod - 4 x 1M length with 8 x M8 Nuts (Stainless Steel)