High-impact resistant, lightweight composite foam core for easy 1-step solvent cementing installation. Use with all Genova ABS-DWV fittings. Does not rot, rust, or corrode to keep surface smooth for easy flow. Resists chemicals commonly used in bathrooms and kitchens, unaffected by commonly used household chemicals including drain and bowl cleaners. Conforms to ASTM F 6208-01, NSF Approved.