ality ▁of ▁out let ▁pass ages . ▁This ▁may ▁be ▁done ▁by ▁supp lying ▁fluid ▁control ▁pressure ▁continu ously , ▁or ▁as ▁a ▁pul se , ▁to ▁one ▁of ▁the ▁control ▁ports ▁at ▁the ▁exit ▁end ▁of ▁the ▁no zz le ▁until ▁the ▁high - energy ▁power ▁stream ▁is ▁di vert ed . ▁Alternatively , ▁switching ▁may ▁be ▁effect ed ▁by ▁closing ▁the ▁other ▁control ▁port ▁so ▁that ▁the ▁fluid ▁that ▁is ▁flow ing ▁in ▁through ▁one ▁control ▁port ▁from ▁the ▁atmosphere ▁or ▁some ▁other ▁source ▁will ▁create ▁a ▁sufficient ▁fluid ▁pressure ▁im bal ance ▁adjacent ▁the ▁exit ▁end ▁of ▁the ▁no zz le ▁to ▁effect ▁switching ▁of ▁the ▁fluid ▁power ▁stream . ▁ ▁In ▁use , ▁a ▁fluid ▁ampl ifier ▁would ▁typically ▁be ▁connected ▁to , ▁and ▁receive ▁the ▁high - energy ▁power ▁stream ▁from , ▁a ▁separate ▁fluid ▁supply ▁manifold ▁that ▁had ▁been ▁previously ▁installed . ▁ ▁Typ ical ▁Install ation ▁for ▁F ount ains ▁Typ ical ▁Install ation ▁for ▁Play de cks ▁ ▁Where ▁used ▁ ▁White ▁Square , ▁Moscow , ▁Russia ▁ ▁O asis ▁and ▁All ure ▁of ▁the ▁Se as , ▁Aqu a The atre ▁ ▁Town ▁Lake , ▁Austin , ▁USA ▁ ▁East on ▁Town ▁Center , ▁Columb us , ▁USA ▁ ▁Gate way ▁Theatre ▁of ▁Sho pping ▁Bou lev ard ▁Water ▁Fe ature , ▁Dur ban , ▁South ▁Africa ▁ ▁Metropolitan ▁Wars aw , ▁Poland ▁ ▁K ual a ▁L ump ur ▁City ▁Centre ▁F ount ain , ▁K ual a ▁L ump ur , ▁Malays