Cerobit Fuel Water Separator Marine Kit R12T 120AT — 10 Micron Filter for 3/8-inch NPT Outboard Diesel Equipment

Overview

The Cerobit Fuel Water Separator Marine Kit R12T 120AT delivers a compact filtration solution designed for diesel systems in marine and other compact diesel setups. As a versatile replacement option, it replaces several common part numbers, offering an easy path to compatible maintenance. Before purchasing, please verify the part number to ensure a proper match with your unit.

Key specifications

• Assembly height is 1/4 inch; connection size is M18 X 1.5 center thread; filtration rating is 10 microns; maximum flow is 30 GPH (57 LPH).
• Rotary filter design enables straightforward, tool-assisted replacement; includes a reusable transparent nylon collection bowl and an automatic exhaust to remove excess dirt and water.
• Constructed from durable aluminum for long-lasting service; helps remove iron oxide, dust, and other solids from the fuel path, protecting critical components such as injectors.
• Designed for compact diesel equipment and a wide range of applications, including tractors, skid steer loaders, light industrial gear, generators, and outboard engines.
• Includes a one-year after-sales service commitment; responsive support if you need assistance with installation or fitment.
• Fit type: Universal; four ports (two inputs, two outputs) with plug options accommodate multiple installation layouts.

What it does for your system

Placed in-line between the fuel pump and the throttle body inlet, this unit helps filter out solid contaminants and water that can accumulate in diesel fuel. The transparent bowl allows quick visual checks for sediment, while the bottom outlet provides a convenient way to drain dirt and water without disassembly. With a 10-micron element, the system targets fine particulates that can affect fuel flow and nozzle performance, while maintaining a steady flow up to 30 gallons per hour under typical use.

Installation tips and best practices

• Verify part numbers (S3240, R12T 120AT, Sierra 18-7987, 17670-ZW1-030GH, 802893t) before ordering to ensure compatibility.
• Install in-series between the fuel pump and throttle body; configuration supports four ports with two inputs and two outputs.
• Apply Teflon tape to capped ports to prevent leaks, then tighten with a suitable tool to seal joints securely.
• Before first use, add a small amount of oil to the filter as part of the setup steps, and inspect the nylon bowl for proper seating.
• Keep the nylon bowl in place; it is reusable and designed to collect contaminants without requiring disposal unless damaged.

Ideal applications

The kit is optimized for diesel-powered equipment used in rugged environments. It suits marine outboards, compact off-road machines, and other diesel systems where straightforward maintenance and visibility matter. The design emphasizes reliability, ease of servicing, and flexible installation to fit various layouts.