Bild Expansion Ring Coupling for Single Jacket Hose, Brass Markets Fire Protection Jump to Section Product Options Related Products Product Options Part Number Bowl Size Hose Size Thread Material RS15175 1-3/4" 1-1/2" NPSH Brass RS15175F 1-3/4" 1-1/2" NST (NH) Brass RS15181F 1-13/16" 1-1/2" NST (NH) Brass RS25281F 2-13/16" 2-1/2" NST (NH) Brass Related Products Bild Expansion Ring Bild Expansion Ring Coupling for Double Jacket Hose, Aluminum Bild Expansion Ring Coupling for Double Jacket Hose, Brass Bild Expansion Ring Coupling for Single Jacket Hose, Aluminum Bild Swivel Washer Bild Tail Washer