Comparison : Item # 1317-18-047LF, 1/4" Tube O.D. Lead Free Brass Compression Cap
Item # 1317-18-048LF, 3/8" Tube O.D. Lead Free Brass Compression Cap
Item # 1317-18-049LF, 1/2" Tube O.D. Lead Free Brass Compression Cap
Item # 1317-18-050LF, 5/8" Tube O.D. Lead Free Brass Compression Cap