Description

Mercury MerCruiser Quicksilver 34423, commonly listed as 32-34423, is a genuine OEM hose used on older MerCruiser stern drive and engine applications. Current Mercury dealer listings identify the active part simply as HOSE, while the directly superseded reference 34423A1 is described as HOSE ASSEMBLY, VENT (4 3/4″), which gives the strongest supportable clue to its function without overclaiming beyond the SKU.

Key Features

• Genuine Mercury Marine OEM part number 34423 / 32-34423.
• Current Mercury dealer listing identifies it as HOSE.
• Direct superseded reference 34423A1 is listed as HOSE ASSEMBLY, VENT (4 3/4″).
• Current dealer listing shows GTIN / UPC 745061137202.
• Current shipping-spec listing shows approximate packaged size of 18.50 x 1.00 x 0.75 in and weight of 0.13 lb.

Engine Compatibility

The strongest supportable fitment for 34423 is older Mercury MerCruiser carbureted engine and stern drive applications rather than one narrow current engine family. Current supersession and dealer references tie it to older GM 181 I/L4, GM 250 I/L6, and TR / TRS stern drive applications, and the superseded part trail shows earlier vent-hose variants used on older MerCruiser carburetor and vent-elbow layouts.

Serial Number Fitment Notice

Verify fitment by exact engine or drive serial number and the correct Mercury parts diagram before ordering. With 34423, the safest match is the specific hose callout in the carburetor / vent / stern drive assembly, because current supersession references fold several older hose numbers into this one active SKU.

When This Part Needs Replacement

This hose is typically replaced when the original is cracked, hardened, oil-soaked, split, collapsed, or no longer seals correctly in the system it serves. Because the superseded descriptions connect 34423 to older vent-hose style applications, replacing an aged original during related carburetor or drive service is usually the smarter move than reusing brittle original hose material. This service guidance is a practical inference based on the documented hose and vent-hose references tied to the SKU.

Installation Notes

Install 34423 only after confirming the exact Mercury MerCruiser parts diagram for the engine or drive being serviced. Current references show the active number replacing several older hose variants, so the right approach is to match the SKU to the exact assembly location first rather than relying on a generic hose description alone.

Alternate/Superseded Part Numbers

Current supersession references connect 34423A1, 33199, 33458, 32846, 39786, and 36119 to active part number 34423. Those earlier numbers were used for more specific hose descriptions in older cataloging, so they are best treated as legacy or superseded references tied to the current SKU.

Parts Desk Insight

Part 34423 consolidates several older vent-hose style applications into one active SKU, so matching the exact serial-number-based diagram is the safer move than relying on a more specific old description by itself.

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