Yellow Plastic 4 1/2" NH Fire Hydrant Cap Threads_NPSH This is a component of

This is a component of Mop-Up Kit NSN 4210-01-321-4206

Approx hole size 1" x 1/4"

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These 4 inch storz replacement couplings come complete with hose shank

Yellow Plastic 4 1/2" NH Fire Hydrant Cap Threads_NPSH This is a component ofThermoplastic 4 1 2 inch NH NST threaded cap and 1 1 8 inch pentagonal nut with weep hole. Constructed from hardened thermoplastic. This cap is intended to keep out dust and debris but NOT intended to hold pressure as it features a weep hole in the center nut and does not have a gasket. May be used in some dry hydrant applications and to cover other non pressurized openings with 4. 5" NH NST threads.