The classic Fleck metal bypass is a stainless block clipped to the back of the control head — not a loop of pipe. One long flat lever works it, and the words SERVICE and BYPASS are stamped into the round plate around the lever's pivot. This drawing faces the FRONT of the unit (that's the 5600 timer dial you see): facing the front, water enters on the right and exits on the left — the Fleck install guides state it in exactly those words. The lever itself is on the back face of the block; it is drawn here in place, and its positions are the ones in the manufacturer's own operation figure: grip pointing up = SERVICE; grip swung a quarter turn = BYPASS. Working the real valve from behind, everything swaps sides — from behind, the inlet is on your left and the grip ends up pointing to your left. (Fleck also sells plastic bypasses with two small handles or two knobs — different part, see the note below.)
Right now: SERVICE. The lever's grip points UP, toward the pipes — and the word SERVICE is stamped on the pivot plate under it. No guessing — the valve tells you where it is.
Sources: Pentair Fleck SXT Owner's Manual, "Bypass Valve Operation — Metal Bypass Valve" (turn the handle until the arrow points to BYPASS / SERVICE); the WATCO Contractor Series manual's Figure 4, “Stainless Steel Bypass Valve Operation,” which draws this exact bypass: SERVICE = grip pointing up, BYPASS = grip rotated a quarter turn (in that figure, drawn from behind the unit, the grip ends pointing to the viewer's left — the same motion this front-view drawing shows ending to the right). Port sides: Clean Water Store's Fleck 5600-SXT Installation & Start-Up Guide — “As you face the Fleck 5600-SXT control from the front, the water enters on the right and exits on the left. From the back, the water enters on the left”; the words SERVICE (lower-left arc) and BYPASS (lower-right arc) are stamped around the pivot on the back face (Pentair's parts list calls it the bypass label, part 13604-01). CORRECTED 2026-11-02 (accuracy audit): the earlier version drew the lever pointing down in service with a half-turn swing between two misplaced “stamped here” labels, and claimed a behind-the-unit view while drawing the front timer dial — the swing is a quarter turn, and the view is now stated and drawn as the front. Plastic Fleck bypasses differ: two small handles (bypass = both across the pipes) or two knobs (bypass = both turned clockwise until the holes face up). Full evidence: animations/accuracy-audit.md.