Nominal Size	Galvanized Pipe	Stainless Steel Pipe		Copper Tube
	Nominal Size	Nominal Size(SCH)	Nominal Size(SU)	Nominal Size
S1015	10A x 15A	10A x 15A	13 x 20	13 x 20
S1520	15A x 20A	15A x 20A	20 x 25	20 x 25
S2025	20A x 25A	20A x 25A	25 x 30	25 x 30
S2532	25A x 32A	25A x 32A	30 x 40	30 x 40
Standard	KS D 3507	KS D 3576	KS D 3595	KS D 5301