Anvil increased its Gruvlok CTS copper offering The Gruvlok figure 6045 CTS mechanical tee provides a branch connection and figure 6047 CTS mechanical cross provides a cross connection in type K, L or M copper tube, both with NPT female pipe thread branches. Figure 6045 and 6047 are available in sizes 2-1/2" by 3/4" through 4" by 1-1/2". Anvil International.