Imagen King Combination Nipple NPT Threaded End with Knurled Wrench Grip Markets Energía / Combustible y Gas, Transportación Product Options Part Number Size Material ST1 STC1 BST1 1/2" (15 mm) Brass AST1 1/2" (15 mm) Aluminum ST5 STC5 BST5 3/4" (20 mm) Brass AST5 3/4" (20 mm) Aluminum ST10 STC10 BST10 1" (25 mm) Brass AST10 1" (25 mm) Aluminum ST15 STC15 ST20 STC20 ST25 STC25