4" Female NPT x 5" Storz x (2) 2½" F NST, Red Powder Coated Siamese Storz Connection - SZ11B

Kochek SZAF03 is simply a combination of a storz with a traditional threaded siamese FDC. Generally mounted to the exterior wall of a building, siamese storz connections give fire fighters the option of attaching a large diameter hose with storz couplings or a smaller diameter hose with 2½" threaded couplings.