A -10 AN Y-block adapter for splitting a single feed into two branches, or merging two lines back into one. The three ports are all -10 AN, so it drops straight into an existing -10 plumbing run without step-down adapters. Typical uses include feeding twin fuel rails from one pump outlet, splitting a return line, running dual filters or turbo oil feeds, and branching a cooler circuit. Machined from one piece of billet so there are no pressed joints to work loose under vibration. Seal it with -10 hose ends or -10 male flare adapters — the AN flare seat does the sealing, so no tape or thread sealant is needed on the flare face. Support the block with a P-clip on longer unsupported runs.