The -06 AN Y-block is the small-line member of the family, suited to the tighter plumbing found on fuel returns, vacuum and boost reference lines, gauge feeds and single-turbo oil circuits. All three ports are -06 AN, so it inserts into a -06 run without changing hose size or introducing a restriction where the branch occurs. Because it is machined as one piece, it stays compact enough to tuck behind a firewall or alongside a chassis rail where a bulkier tee will not fit. Assemble with -06 hose ends or -06 male adapters and tighten to the flare seat only — the 37° flare provides the seal, so avoid thread sealant. Fit a P-clip nearby if the branch carries any hose weight.