The main section and lower lid is machined from a solid piece of Delrin®, an exceptionally rigid and durable construction thermoplastic. 

The upper lid is made from hard anodised aluminium, which makes it resistant to abrasion and weather factors as well as provide increased thread strength for repeated tightening and unscrewing the cable plug.

The canister is sealed with two O-rings and equipped with an overpressure safety valve.