Series 1999 12-Volt DC Electric Boom Shutoff Valves have a 1" NPT female, 1" male bypass outlet, and 3/4" NPT female boom line outlet for high volume applications at minimum pressure loss (pressure drop is only 5 psi at 18 GPM). Current draw of only 1 amp per valve. Chemical resistant glass-filled nylon body with Viton or Aflas diaphragm and seals. Response time, .2 seconds turn-on; .5 turn-off. Maximum operating pressure is 175 PSI. For multiple valve units, simply screw one valve to another. 32°-150®F.