3IN NO HUB COUPLINGS UPC LISTED STANDARD DUTY TYPE; FLEXIBLE RUBBER, 310 STAINLESS STEEL (BAND) MATERIAL; 3 INCH SIZE A; 3 INCH SIZE B; ISO 9001, IAPMO, CSA B602, UPC, IPC, CISPI 310 APPLICABLE STANDARD; SCHEDULE 40 PIPE APPLICATION; ASTM C564/C1277 MATERIAL SPECIFICATION