Comparison : Item # 1317-57-100, 1" Tube O.D. x Close (1-1/2") Length Schedule 40 Welded Nipple Black Steel
Item # 1317-57-101, 1" Tube O.D. x 2" Length Schedule 40 Welded Nipple Black Steel
Item # 1317-57-102, 1" Tube O.D. x 2-1/2" Length Schedule 40 Welded Nipple Black Steel
Item # 1317-57-103, 1" Tube O.D. x 3" Length Schedule 40 Welded Nipple Black Steel
Item # 1317-57-104, 1" Tube O.D. x 3-1/2" Length Schedule 40 Welded Nipple Black Steel