Description Item # 2" Flap Insert fits inside 2" rubber hose, 2.25" long 9030-20 3" Flap Insert fits inside 3" rubber hose, 3.375" long 9030-30 4" Flap Insert fits inside 4" rubber hose, 4.08" long 9030-40 4" External Rubber Flap 040001 4" Stainless steel hose clamp 040010 2" Internal Flap, 316L sst, metal to metal seal 101920 3" Internal Flap, 316L sst, 250 degree F polymer 101881 4" Internal Flap, 316L sst, 250 degree F polymer 101015 4" Heavy Duty T-Bolt Clamp 040240 4.5" Heavy Duty T-Bolt Clamp 040245 5" Heavy Duty T-Bolt Clamp 040250