Sierra 18-71337 Molded Circulating Pump Hose, 1 3/4 Inch ID, for 4.3L 5.0L 5.7L Marine Engines

The Sierra 18-71337 is a molded circulating pump hose built for marine engines, designed to carry coolant between the circulating pump and engine block on 4.3L, 5.0L, and 5.7L powerplants. Constructed from a plastic and rubber material blend, the hose holds its molded shape under engine bay heat and vibration instead of collapsing or kinking the way a straight-cut length of tubing can. Its 1 3/4 inch inside diameter and 12 3/4 inch length are engineered to match factory routing, so it drops into the original hose run without trimming or reshaping.

This hose is a direct fit for engines originally fitted with a range of OEM circulating pump hoses, and it is built to meet or exceed the performance of the part it replaces. It is a straightforward swap for anyone doing routine cooling system maintenance or replacing a cracked, hardened, or leaking hose before it causes a coolant loss or overheating issue underway.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-71337
• Product Type: Molded Hose (Circulating Pump Hose)
• Inside Diameter: 1 3/4 inches
• Length: 12 3/4 inches
• Material: Plastic, Rubber
• Color: White
• Weight: 0.92 pounds
• UPC: 030999568243
• Engine Compatibility: 4.3L, 5.0L, 5.7L marine engines

Fitment

Fits 4.3L, 5.0L, and 5.7L marine engines as a circulating pump hose.

Replaces (OEM)

• Mallory 9-44052
• Mercruiser 32-33189
• Mercruiser 32-33189A1
• OMC 312781

Frequently Asked Questions

What engines is the Sierra 18-71337 hose designed for? The Sierra 18-71337 molded circulating pump hose is designed for 4.3L, 5.0L, and 5.7L marine engines.

What is the inside diameter of this hose? The 18-71337 has a 1 3/4 inch inside diameter.

How long is the Sierra 18-71337 hose? It measures 12 3/4 inches in length.

What is the 18-71337 hose made of? Sierra molds this hose from a plastic and rubber material blend for heat and vibration resistance in the engine bay.

Will this hose replace my OEM circulating pump hose? Yes, the 18-71337 is built as a direct replacement for the OEM circulating pump hose on 4.3L, 5.0L, and 5.7L engines and is designed to meet or exceed original equipment performance.

Does the 18-71337 cross-reference to Mercruiser part numbers? Yes, the Sierra 18-71337 hose is interchangeable with Mercruiser 32-33189 and 32-33189A1.

Is this hose the same part as OMC 312781? Yes, the 18-71337 is interchangeable with OMC 312781, used on both OMC inboard and OMC stern drive applications.

Does this hose cross to a Mallory part number? Yes, the 18-71337 is interchangeable with Mallory 9-44052.

What color is the Sierra 18-71337 hose? It is white.

How much does the 18-71337 hose weigh? The hose weighs 0.92 pounds.

What is included when I order this hose? One Sierra 18-71337 molded circulating pump hose is included; no clamps or fittings are packaged with it.

Is the Sierra 18-71337 a genuine Sierra part or an aftermarket copy? The 18-71337 is a genuine Sierra International part, manufactured to meet or exceed the performance of the original equipment hose it replaces.