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The Goodman A3468601 Pressure Switch Tubing is a genuine OEM 3/16" inside-diameter hose for the Amana/Goodman AMS80905CXA 80% AFUE gas furnace. This flexible line connects the pressure switch to the inducer/vent draft port and carries the negative-pressure signal that proves proper venting before the furnace allows ignition. Cracked, brittle, or clogged tubing is one of the most common causes of a stuck-open pressure switch and no-heat lockout.
The OEM Goodman tubing uses the correct 3/16" ID and heat-rated material so it seals tightly on both ports and won't collapse or harden near the inducer. Generic tubing that is slightly oversized, undersized, or made of the wrong material can leak the pressure signal, causing intermittent lockouts that are difficult to diagnose. OEM ensures a reliable draft-proving circuit.
Rated Very Easy (1/5). Under 10 minutes, no tools required. Disconnect power, pull the old tubing off both barbed fittings, route the new hose the same way (avoiding kinks and low spots that trap condensate), and press it firmly onto each port.