Firestone 9.00R20 Inner Tube. TR443 valve stem. NSN 2610-00-029-0559. Get it here and save some money. Military Specs: AAFS Application Design Truck and bus AAFU Size Designation 9.00-20 AAFZ Body Material Rubber, natural and rubber, synthetic ABBS Inflation Device Type TR443 ABBT Inflation Device Position On center ABBW Construction Radial ABBX Base Construction Standard ABBY Splice Minimum Rated Tensile Strength 500 pounds per square inch ASQJ Operating Temp Range in DEG Celsius -40.0/+51.7 CQBC Minimum Tensile Strength 1200 pounds per square inch FEAT Special Features Length 4.92 inches straight; 4.5 inches bent; used on af; air rotary compressor model DR600 ZZZT Nondefinitive Spec/STD Data 2 group 15338 R5C7