Oregon 71-274 4-inch Tire Innertube 280/250-4 Bent Valve Fits Echo PB4600-059919 and up, PB6000 Blower, PB 60-HT-Type 1E, PB4600 Type-1E, PB46HT-Type 1E 10-3/8in L x 2-7/8in W x 1-11/32in H