Rojo Arm Extension vs. Arm Carrier Extension: Not the Same Adjustment

Both of these parts have "extension" in the name and both change where your float sits — but they're built for different valve families and they solve genuinely different adjustment problems. Easy to grab the wrong one if you're not sure which line you're running.

Rojo Arm Extension: Fine Reach Adjustment

The Rojo Arm Extension is for Rojo valves specifically. It extends the float arm's physical reach — useful for clearing a tank wall, reaching a lower fill line, or fitting an unusual mounting position where the stock arm just doesn't extend far enough. It comes in four lengths (1", 2", 3", 4") plus a dedicated 3" yellow version for Rojo Hi-Flow, so you can dial in exactly how much extra reach you need rather than overshooting. Priced $5.99–$6.99 depending on length.

Arm Carrier Extension: Lowering the Shut-Off Level

The Arm Carrier Extension is a completely different tool, built for Topaz and Vortex instead of Rojo. Rather than extending reach, it lowers the float's shut-off level by 3.25" (80mm) — useful when a tank needs to run at a lower working level than the valve's stock configuration allows. Multiple units can be stacked for a bigger drop, and the float can also attach directly to the extension itself rather than the original arm. One universal size, $8.99.

The Real Difference

Rojo Arm Extension changes how far the arm reaches. Arm Carrier Extension changes how low the shut-off point sits. They're not interchangeable, and they don't even fit the same valve lines — check which valve you're running (Rojo vs. Topaz/Vortex) before ordering either one.