Kuriyama’s unique Tri-Couple™ fitting design (Patent Pending) eliminates the need for separate fittings when using clamps, sleeves or ferrules. The same great quality Kuriyama couplings are redesigned for maximum inventory control. They are available in Aluminum, ALSH, 316 Stainless Steel, 304 Stainless Steel and Ductile Iron materials. The Tri-Couple™ design is also available on our interlocking crimp nipples. Select sizes available up to 6".