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Inboard & Sterndrive - Gaskets & Sets

O2 Spacer, Stock Mercury Riser
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O2 Spacer, Stock Mercury Riser


O2 Spacer, Stock Mercury Riser

This Unique 1" thick adapter plate provides an installation option for retro fitting a Oxygen sensor and or air fuel ratio gauge for tuning purposes Into Mercruisers most common Wet Joint style exhaust manifold systems. The part is CNC machined from 6061 Billet Aluminum then Naval Spec Hard Coat anodized for corrosion resistance (Beware of inferior non-coated versions)

A unique feature of this adapter is the cooling parts that run along each side of the sensor maintaining consistent temperature of the spacer. Designed to accept all popular 18MM O2 Oxygen sensors.

  • Mercury 3 and 4" Riser Gasket(700-32080) 2 Required
  • Stainless Steel 18MM Oxygen Sensor Plug(620-50031) 1 Required