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The most common fire fitting thread in the United States is 2 1/2 inch NH /NST
Locking springs prevent unintentional disconnects
Use Rack Nipple - SKU PRN150F
9 threads per inch and male 1 1/2 inch NH
Install so that flap hangs down due to gravity
Female 4 1/2" Dry Hydrant 90 Degree Adapter Same Day Shipping_Yes The most common fire fittingFemale red dry hydrant adapter with aluminum NH NST plug. Comes attached to a PVC slip socket adapter for glue on connection to straight 6 inch schedule 40 PVC pipe. Material is light weight 6061 T6 aluminum alloy. All parts meet or exceed NFPA requirements. Our dry hydrant adapters fit all firefighting requirements as well as those for rural dry hydrant systems. Includes screen, plug, and chain. Dry hydrant sizes are determined by your local fire