4 X 4-1/2 FNST. The Lansdale Storz Hydrant Adapter is a permanent Storz adapter that is secured to the hydrant with two set screws. The Storz adapter is made from 6061-T6 aluminum with a flat rubber gasket that seals the adapter to the hydrants male steamer port. For security the Storz cap requires a spanner wrench to remove it, however the Storz hose coupling will disconnect quickly by hand. When installed, the Storz connection extends 2.75 " from the hydrant nozzle.