Brass 1 1/2" NH to 1" NPT Double Male (Hex) Female Size_GHT They are usually labeled FDC

They are usually labeled FDC (Fire Department Connection) and/or AUTO SPKR (Automatic Sprinkler)

If your FDC is approx

with three 2" wide

Durable all-steel construction

Compatible part number - DFP2525

Brass 1 1/2" NH to 1" NPT Double Male (Hex) Female Size_GHT They are usually labeled FDCMale to male adapters are used to bridge male to female hoses, pipes or valve fittings. Brass is commonly chosen for corrosion resistance, and is popular with chemical or salt water applications. Compatible part number DMH1015F WARNING: This product contains a chemical known to the State of California to cause birth defects or other reproductive harm. Do not use in connection with drinking water. Wash hands after handling. Brass Male to Male Adapter