OFS-PRO Engine Setup Fittings Kit | Reverso 35-3955-01-04

Reverso OFS-PRO Engine Setup Fittings Kit | 35-3955-01-04 | Oil Flushing System Engine Adapter Kit

The Reverso #35-3955-01-04 is an engine setup fittings kit for the Reverso OFS-PRO oil change and flushing system. Like all Reverso OFS-PRO engine fittings kits, this part provides the engine-side adapter connections that mate the OFS-PRO system to your specific engine's oil drain, oil fill, and raw water flush ports. The suffix -04 designates the engine application this kit is engineered for — verify fitment against Reverso's engine compatibility guide or your engine's parts documentation before ordering. If you are unsure whether the -04 or another suffix kit (such as the 35-3955-01-03) is correct for your engine, contact us at MacombMarineParts.com with your engine make, model, and year before ordering.

Part Details:

• Part Number: 35-3955-01-04
• SKU: REVERSO-35-3955-01-04
• Manufacturer: Reverso
• Type: OFS-PRO Engine Setup Fittings Kit — Engine-Side Adapter Kit
• Application: Engine-specific — verify fitment against Reverso's compatibility guide for your engine make, model, and year before ordering
• Related Kit: 35-3955-01-03 — alternate engine application fittings kit; confirm which suffix applies to your engine
• Use: Connects Reverso OFS-PRO system to engine oil drain, oil fill, and raw water flush ports
• Condition: New
• Country of Origin: USA

Additional Information

How Reverso OFS-PRO Engine Fittings Kits Work:

The Reverso OFS-PRO is a permanently installed marine oil change and engine flushing system. The system connects to three points on the engine: the oil drain port, the oil fill port, and the raw water cooling inlet. Once installed, routine oil changes, post-use flushing, and winterization antifreeze circulation are all performed through quick-connect fittings routed to an accessible location — no bilge access, no mess, no hand pump required.

Because marine engines vary significantly in their oil drain port location, thread size, and raw water inlet configuration, Reverso engineers engine-specific fittings kits for each supported engine family. The part number suffix (-01, -02, -03, -04, etc.) identifies the engine application. Installing the wrong fittings kit for your engine will result in thread mismatch, incorrect port sizing, or an incompatible connection that cannot be made leak-free. Always confirm the correct suffix for your engine before ordering any Reverso OFS-PRO engine fittings kit.

-03 vs. -04 — Which Kit Do I Need?

The 35-3955-01-03 and 35-3955-01-04 are both OFS-PRO engine setup fittings kits for different engine applications. The correct kit depends entirely on your engine make, model, and year — not on a general preference between the two. Use Reverso's engine fitment guide to identify which suffix applies to your engine, or contact us at MacombMarineParts.com with your engine details and we'll confirm the right kit before you order.

If you are building a complete Reverso OFS installation, also see:

• Reverso OFS-PRO 3 Engine Setup Fittings Kit (35-3955-01-03) — alternate engine application fittings kit
• Reverso OFS 9-Foot Inlet Hose Kit (35-3951-05) — freshwater supply extension for OFS and OFS-Pro units
• Reverso OFS 6-Foot Inlet Hose Kit (35-3951-04) — shorter freshwater supply extension option
• Reverso OFS Remote Switch with 18-Foot Harness (35-3954-06) — helm or console remote trigger for OFS Version 3.0 units

Frequently Asked Questions

1. How do I know if I need the -04 kit or the -03 kit?
The correct kit is determined by your engine make, model, and year — not by a general comparison between the two kits. Consult Reverso's engine fitment guide to identify which suffix applies to your engine. If you cannot determine the correct kit from the fitment guide, contact us at MacombMarineParts.com with your engine's make, model, year, and serial number and we'll confirm the correct fittings kit before you order. Do not order based on part number similarity alone.

2. What ports does this fittings kit connect to on the engine?
Reverso OFS-PRO engine fittings kits connect to the engine's oil drain port, oil fill port, and raw water cooling inlet. The specific fitting types, thread sizes, and connection configurations in the kit are matched to the engine application designated by the part number suffix. This is why engine-specific kits are required — a universal fitting cannot reliably seal against the varied port configurations across marine engine families.

3. Is this the complete OFS-PRO flushing system or just the engine fittings?
This is the engine-side fittings kit only — it is one component of a complete Reverso OFS-PRO installation. The OFS-PRO pump unit and any inlet hose or routing hardware are separate components. Contact us at MacombMarineParts.com for help specifying a complete OFS-PRO system for your engine and vessel.

4. Can these fittings be used for antifreeze winterization?
Yes — the raw water flush circuit connection included in the Reverso OFS-PRO engine fittings kit allows you to circulate antifreeze through the raw water cooling passages during winterization, in addition to post-use and seasonal flushing. This eliminates the need for a separate flush adapter at the lower unit during winterization.