Your SeaSmart comes with a 1.8metre (6ft) microbore disinfectant tube you cut to your required length with scissors and slide down inside your inlet sanitation hose to the seacock.
\nIf your inlet sanitation hose is longer than 1.8 metres (6ft) from seacock to the flush pump this 2 metre extension simply pushes on to the existing disinfectant tube supplied and extends it by up to another 2 metres (7ft). (Not required for Fresh Water Flushed toilets)