With 10 years' experience, we have sizes ranging from 5/16" to 8-1/8 and 6mm to 219mm. Our products comply with ANSI/ASME B16.22 Standard, EN1254-1/BS864-2 Standard and R410A High Pressure Standard. Our fittings have already been approved by UPC, NSF61 and WRAS.Our main products are as follows:1 American standard ANSI/ASME B16.22 solder joint copper fittings (size: from 5/16"to 8-1/8" )2 American standard ANSI/ASME B16.22 solder ring copper fittings (size: from 1/2"to 2-1/8")3 European standard EN1254-1 solder joint copper fittings (size: from 6mm to 219mm)4 European standard EN1254-1 solder ring copper fittings (size: from 8mm to 54mm)5 Copper wrot thread adapters6 Brass wrot thread fittings7 Air-conditioner copper fittings8 R410a high pressure copper fittingsYou are welcome to visit our website: www.nbhengsheng.com or send your enquiry to sales: @nbhengsheng.com