Plumbing Supplies
YINZHD 1/4" 3/8" 1/2" 6.35 8 10 14 15 16-219mm ID Pure Copper End Feed Solder 90 Degree Elbow Plumbing Fitting Coupler Air Conditioner(ID 76mm Wall 2.0mm)
Mm to Inch 6.35mm = 1/4" (Fit US DN4 1/8" Pipe) 9.52mm = 3/8" (Fit US DN8 1/4" Pipe) 12.7mm = 1/2" (Fit US DN10 3/8" Pipe) 15.88mm = 5/8" (16mm)(Fit US DN15 1/2" Pipe)
https://www.bizrate.co.uk/plumbingsupplies/yinzhd-1-4-3-8-1-2-6-35-oid38468316606.html
