<P> Flare connections require that the end of a tubing section be spread outward in a bell shape using a flare tool . A flare nut then compresses this bell - shaped end onto a male fitting . Flare connections are a labor - intensive method of making connections, but are quite reliable over the course of many years . </P> <P> Crimped or pressed connections use special copper fittings which are permanently attached to rigid copper tubing with a powered crimper . The special fittings, manufactured with sealant already inside, slide over the tubing to be connected . Thousands of pounds - force per square inch of pressure are used to deform the fitting and compress the sealant against the inner copper tubing, creating a water - tight seal . The advantages of this method are that it should last as long as the tubing, it takes less time to complete than other methods, it is cleaner in both appearance and the materials used to make the connection, and no open flame is used during the connection process . The disadvantages are that the fittings used are harder to find and cost significantly more than sweat - type fittings . </P> <Table> <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> <Tr> <Td> ⁄ </Td> <Td> ⁄ (12.7) </Td> <Td> 0.402 (10.211) </Td> <Td> 0.430 (10.922) </Td> <Td> 0.450 (11.430) </Td> </Tr> <Tr> <Td> ⁄ </Td> <Td> ⁄ (15.875) </Td> <Td> 0.528 (13.411) </Td> <Td> 0.545 (13.843) </Td> <Td> 0.569 (14.453) </Td> </Tr> <Tr> <Td> ⁄ </Td> <Td> ⁄ (19.05) </Td> <Td> 0.652 (16.561) </Td> <Td> 0.668 (16.967) </Td> <Td> 0.690 (17.526) </Td> </Tr> <Tr> <Td> ⁄ </Td> <Td> ⁄ (22.225) </Td> <Td> 0.745 (18.923) </Td> <Td> 0.785 (19.939) </Td> <Td> 0.811 (20.599) </Td> </Tr> <Tr> <Td> </Td> <Td> 1 ⁄ (28.575) </Td> <Td> 0.995 (25.273) </Td> <Td> 1.025 (26.035) </Td> <Td> 1.055 (26.797) </Td> </Tr> <Tr> <Td> 1 ⁄ </Td> <Td> 1 ⁄ (34.925) </Td> <Td> 1.245 (31.623) </Td> <Td> 1.265 (32.131) </Td> <Td> 1.291 (32.791) </Td> </Tr> <Tr> <Td> 1 ⁄ </Td> <Td> 1 ⁄ (41.275) </Td> <Td> 1.481 (37.617) </Td> <Td> 1.505 (38.227) </Td> <Td> 1.527 (38.786) </Td> </Tr> <Tr> <Td> </Td> <Td> 2 ⁄ (53.975) </Td> <Td> 1.959 (49.759) </Td> <Td> 1.985 (50.419) </Td> <Td> 2.009 (51.029) </Td> </Tr> <Tr> <Td> 2 ⁄ </Td> <Td> 2 ⁄ (66.675) </Td> <Td> 2.435 (61.849) </Td> <Td> 2.465 (62.611) </Td> <Td> 2.495 (63.373) </Td> </Tr> <Tr> <Td> </Td> <Td> 3 ⁄ (79.375) </Td> <Td> 2.907 (73.838) </Td> <Td> 2.945 (74.803) </Td> <Td> 2.981 (75.717) </Td> </Tr> </Table> <Tr> <Th_colspan="5"> Copper Tubing Sizes (CTS) for Plumbing </Th> </Tr>

What is the smallest size of type m copper tube available
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