a telescopic high pressure sprinkler system is provided with a plurality of gaskets forming sliding seals between the piston and the outer conduit . thus , the volume between the piston and the outer conduit forms a fluid chamber that is compressed as the piston is deployed so as to dampen the acceleration of sprinkler deployment . furthermore , bleeder holes are provided to regulate the fluid chamber &# 39 ; s compression while the gaskets provide a cushion when the piston comes to a stop .