<Tr> <Th_colspan="5"> Copper Tubing Sizes (CTS) for Plumbing </Th> </Tr> <Tr> <Th> Nominal size </Th> <Th> Outside diameter (OD) (in (mm)) </Th> <Th_colspan="3"> Inside diameter (ID) (in (mm)) </Th> </Tr> <Tr> <Th> Type K </Th> <Th> Type L </Th> <Th> Type M </Th> </Tr> <Tr> <Td> ​ ⁄ </Td> <Td> ⁄ (9.5) </Td> <Td> 0.305 (7.747) </Td> <Td> 0.315 (8.001) </Td> <Td> </Td> </Tr>

What type of copper tubing is used for hvac