Underhill NG550-DFL-75 Magnum UltraMax Turbo Shift Nozzle 3/4" FHT Dual variable flow-delivers light fog and low volume jet stream patterns before shifting to high volume jet stream and fan patterns Opens at 7-12 GPM and be "turbo shifted" to 14-17 GPM Recommended for commercial and residential use with lower pressure, minimum 50+ psi needed Firefighter quality nozzles is made of aircraft aluminum, stainless steel and TPR rubber Use with UltraMax pistol grip or firefighter grip valve (sold separately, items SV or SVPG)