Aluminum 2 1/2" Storz x 3" Male NPT Thread Male Size_3 Inch you probably need this plug

you probably need this plug

Equivalent part number - HA40F40T

This is the most common replacement plug size in the US

Compatible part number - DMH1015F

Aluminum plugs are fabricated from seamless extruded 6061-T6 aluminum and hard coat anodized per MIL-A-8625 Type III

Aluminum 2 1/2" Storz x 3" Male NPT Thread Male Size_3 Inch you probably need this plugStorz Head component shall be forged from Alloy 6061 aluminum and heat treated to T6 temper. Adapters and components meet the requirements of NFPA 1963. Locking Storz are only available on 4, 5, and 6 inch. Locking springs prevent unintentional disconnects. Locks are stainless steel. The Safe Water Drinking Act section 1417 requires "Lead Free" products to be a minimum of 99. 75% lead free. Download Spec Sheet