The Cocon 13 is the smallest model in the Gorter Cocon family of subterranean modules. Cocon 13 lowers impacts on the environment and noise, while giving protection from accidents or vandalism. Cocon 13 is Underground, implying that the landscape is untouched. Vandals will not be able to enter the unit. Low noise level: Significantly lower noise levels than those produced by surface-mounted gas pressure control systems. Low maintenance: Because of the interchangeable connection unit, site inspections and workshop maintenance are easy. Within 10 minutes, the entire connection unit may be swapped. Construction is compact: Installation and removal are both simple. Waterproof: Because of the dual seals. A safety release valve is available as an option.