Plastic 2 1/2" Cap (2 Pack) Threads_NH x NPT This is the most common

This is the most common replacement plug size in the US

Material is aluminum

Brass is commonly chosen for corrosion resistance

Discharge hose while pumping from pool water

RMA Class B (medium oil resistance)

Plastic 2 1/2" Cap (2 Pack) Threads_NH x NPT This is the most commonPlastic breakable cap prevents entry of foreign materials and protects the female threads on pin lug fire department inlet connections (FDC). Breakable to permit fast fire hose connection. Two eyebolts with nuts for attachment to female pin lug swivel are included. These caps will fit the most common Fire Department Connection (FDC) which has 2 1 2" NH NST threads. 2 1 2 inch NH NST threaded fittings actually measure about 3 inches across. The covers