Ventriculo Peritoneal High Pressure with Regular Reservoir VPHP SH201 Each System Is supplied complete with one unitized GSL Dome Valve reservoir with 90cm radio opaque distal part, one 15cm ventricular part and two straight connectors. The system is sterilized by Ethylene Oxide gas and packed in double peel open packaging. Hydrocephalus shunting involves the implantation of two catheters and flow control valve system to drain the excess accumulation of cerebrospinal fluid (CSF) from the brain's ventricles (or the lumbar subarachnoid space) to another part of the body where it can be absorbed.Hydrocephalus shunting involves the implantation of two catheters and flow control valve system to drain the excess accumulation of cerebrospinal fluid (CSF) from the brain's ventricles (or the lumbar subarachnoid space) to another part of the body where it can be absorbed.