Ductile iron end-rings and center-ring have no welds. Heavy-duty stainless-steel bolts with anti-galling protection. 304 stainless steel armors are bonded to the gaskets. Center ring is fusion bonded epoxy, NSF 61 certified. End rings are E-coated epoxy. With a single gasket Macro couplings accommodate IPS through cast iron pipe. XL sizes cover DI through Oversize Cast Iron. For larger pipe diameters such as some asbestos cement, a separate A/C gasket is included. The built-in handle makes the Macro simple to carry and maneuver during installation. Stab-fit installation. Each end of the Macro tightens independently with a single bolt (two bolts each end for 16 inch). If your work space requires it, the end rings can be clocked. The Macro is lighter than traditional wide range couplings.