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Safety pins prevent the cam arms from accidental disconnection during use
They are usually labeled FDC (Fire Department Connection) and/or AUTO SPKR (Automatic Sprinkler)
The female threads of the middle tip on this set of stacks is 1 1/2" Playpipe Thread
ventilate roofs and quickly pull down any type of material from drywall
Two knobs stay stationary
Aluminum 5" Female NH to 4" Male NPT Female Size_2 Inch Safety pins prevent the camAluminum adapters are fabricated from seamless extruded 6061 T6 aluminum and hard coat anodized per MIL A 8625 Type III, Class 1. Threads have a blunt start Higbee cut with indicators on adjacent lugs. Part identifications are permanent and stamped prior to hardcoat. Adapters and components meet the requirements of NFPA 1963. The Safe Water Drinking Act section 1417 requires "Lead Free" products to be a minimum of 99. 75% lead free. Aluminum Female to