1-1/4 in. (31.75 mm) Full Flow Bronze Sight Glass with NPT Thread is a must-have flow test accessory for any water-based system, including fire sprinkler systems. Cast from bronze alloy for lasting performance and serviceability.
The National Pipe Thread (NPT) inlet and outlet make installing and using the 1-1/4 in. (31.75 mm) Bronze Sight Glass easy. This model features a 1-1/4 in. (31.75 mm) Male NPT full flow orifice designed for system flow verification and a 1-1/4 in. (31.75 mm) Female NPT (FNPT) inlet.
Simulated sprinkler system head flow can be viewed through either of two high-impact acrylic windows on either side of the 1-1/4 in. (31.75 mm) Bronze Sight Glass. Each window secures with a leak-proof NBR O-ring.