FPPI Expansion Tank: NFPA 13, 13D and 13R requires the use of an expansion chamber on antifreeze systems with backflow preventers. The TrimFit ET25 is a rubber bladder filled expansion chamber designed for use on antifreeze based fire sprinkler systems.
FIG 06-025 Expansion Tank
Expansion Tank
TRIMFIT® Test & Drain Valve
Swing Check Valves
Globe Valves
Extension Nipples, Brass
Ball Drips, Brass
Adjustable Pressure Relief Valves
Angle Globe Valve
Sight Glass
TrimFit® Bronze Butterfly Valves - FNPT
TrimFit® Bronze Butterfly Valves - Grooved