FUSCH Heater Hose Connectors 2PCS Aluminum 3/4 x 5/8 Inlet/Outlet Kit — O-rings & Stainless Clamps

The FUSCH Heater Hose Connector kit is a pair of upgraded aluminum inlet/outlet fittings (3/4" x 5/8") designed to replace OE plastic heater core connections and restore a secure coolant path.

These two replacement heater hose connectors from FUSCH are built to match common OE fitments while improving on material strength and corrosion resistance. Each kit includes O-rings, clamps, spring clips and disassembly tools so you can swap the fittings without hunting for extra parts. The connectors are compatible with many Chevrolet, GMC, Cadillac, Ford and Lincoln models that use the 3/4" x 5/8" heater core tube size, making this a practical service item for routine cooling-system repairs.

Will these connectors fit my vehicle model?

Check your vehicle's heater core tube sizes and part numbers before ordering. The FUSCH connectors are designed to replace part numbers such as 15032062, 15151875, 800-409HP, 800409HP and 800409 and fit many GM and selected Ford/Lincoln models.

• Direct replacements for OE part numbers listed above.
• Common fitments include: 1999–2008 GMC Yukon, 1999–2013 GMC Sierra 1500, 2012–2014 Cadillac Escalade, and multiple Chevrolet Silverado/Suburban years.
• Also compatible with some Ford F-150 (selected years) and Lincoln models—verify tube diameters before install.

How does the aluminum design improve durability?

FUSCH upgraded the original plastic fittings to anodized aluminum to resist cracking, warping and corrosion under heat and coolant exposure. The surface receives anodic oxidation for extra protection, and included stainless-steel clamps help maintain a leak-free seal over time.

• Anodized aluminum body reduces corrosion and increases strength.
• Comes with 304 stainless steel clamps to prevent clamp corrosion.
• O-rings and spring clips ensure proper sealing and retention at the heater core.

What’s included and how simple is installation?

The kit arrives complete so you can replace both fittings in one service session. Installation is straightforward: remove the old plastic connector, seat the new fitting into the heater core tube, secure with the supplied clamps and verify the O-ring seal. Disassembly/install tools are provided for the two tube sizes so no extra specialty tools are required.

• Kit contains: 2 aluminum connectors, 4 O-rings, 2 spring clips, 2 stainless clamps and two disassembly tools (5/8" and 3/4").
• Simple push-fit to heater core and clamp to coolant hose; retighten after coolant refill and pressure test.
• Designed for DIY or professional installation—no welding or machining needed.

How can I verify leak-free performance after replacement?

After installation, refill the cooling system, bleed air per the vehicle procedure and run the engine to operating temperature while checking the new connectors for drips. The combination of new O-rings, spring clips and stainless clamps minimizes common failure points when installed correctly.

• Pressure-test or visually inspect while engine is warm for any coolant seepage.
• Recheck clamp tightness after a short drive, then again after a few heat cycles.
• Replace O-rings if they appear nicked or compressed during install.

Who is this for: The FUSCH Heater Hose Connector kit is aimed at DIY mechanics, independent shops, and fleet maintenance teams who need a robust, ready-to-install replacement for aging plastic heater core fittings. If you own or service compatible Chevrolet, GMC, Cadillac, Ford or Lincoln models that use 3/4" x 5/8" heater tubes and want a longer-lasting metal alternative with all mounting hardware included, this kit provides a direct, cost-effective solution.