Mercury MerCruiser Vent Hose 32-34423 | GM L4 / L6 & TR / TRS Stern Drive
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Mercury MerCruiser Vent Hose — Part No. 32-34423
This is the genuine Mercury Marine OEM vent hose listed under part number 32-34423 (base number 34423). The directly superseded reference, 34423A1, was catalogued as a Vent Hose Assembly (4 3/4"), which describes the function and approximate length of this hose. It is used on older MerCruiser carbureted engine and stern drive applications where the parts diagram specifically calls for this number, consolidating several earlier hose variants into one active SKU.
Part Details
- Part Number: 32-34423
- Base Number: 34423
- Description: Vent Hose (based on superseded 34423A1 — Hose Assembly, Vent 4 3/4")
- GTIN / UPC: 745061137202
- Approximate Packaged Size: 18.50 x 1.00 x 0.75 in.
- Approximate Weight: 0.13 lb (60 g)
- Type: Genuine Mercury Marine OEM replacement hose
Compatible Applications
- MerCruiser GM 181 I/L4 (inline 4-cylinder) — carbureted applications, per diagram
- MerCruiser GM 250 I/L6 (inline 6-cylinder) — carbureted applications, per diagram
- MerCruiser TR / TRS stern drive applications — vent hose locations per diagram
- Older MerCruiser carbureted engine packages where diagram calls for 34423 / 32-34423
Always confirm fitment by engine or drive serial number and the correct Mercury parts diagram before ordering.
Superseded & Alternate Part Numbers
Part number 34423 consolidates several earlier hose variants into one active SKU. The following numbers are superseded by or cross-reference to 32-34423:
- 34423A1 — direct predecessor (Hose Assembly, Vent 4 3/4")
- 33199 — superseded
- 33458 — superseded
- 32846 — superseded
- 39786 — superseded
- 36119 — superseded
When to Replace
Replace this hose when the original is cracked, hardened, oil-soaked, split, collapsed, or no longer sealing correctly. Because this hose is associated with older carbureted and vent-elbow layouts, it is good practice to replace it proactively during any related carburetor service, drive service, or top-end work rather than reusing brittle original hose material.
Installation Tips
- Confirm the exact diagram position and assembly location before installing — this SKU consolidates several older hose variants
- Match the hose to the specific callout in the carburetor or vent assembly diagram for your engine or drive serial number
- Inspect the hose barbs and fittings at both ends for corrosion or damage before reusing clamps
- Do not rely on hose length or diameter alone — verify by part number and diagram position
Technical FAQ
Q: Why does the current Mercury listing just say "HOSE" with no further description?
A: Mercury's active catalog sometimes simplifies descriptions as part numbers consolidate. The superseded reference 34423A1 — listed as "Hose Assembly, Vent (4 3/4")" — gives the clearest picture of what this hose does and where it goes.
Q: Can I use a generic hose of the same diameter?
A: Not recommended for vent-system applications. OEM hose material is formulated to resist fuel vapors, heat, and the specific pressure conditions of the vent circuit. A generic substitute may degrade faster or not seal correctly at the barb fittings.
Q: My engine serial number isn't listed — will this fit?
A: Fitment on older MerCruiser engines must be confirmed by serial number and diagram. If you're unsure, our parts team can help verify before you order.
Parts Desk Insights
Best use case: This hose is the right call when you have an older MerCruiser carbureted engine or TR/TRS stern drive and the parts diagram specifically calls for 34423 or one of its superseded numbers. It's most commonly needed during carburetor rebuilds, vent system inspections, or any service where the original hose is found cracked or hardened.
Common mistakes: The biggest error is ordering this hose based on a superseded number without checking whether the current active SKU (34423) is actually the right fit for the specific diagram position. Because this number consolidates several older hose variants, it's possible for two different hose locations on the same engine to have been catalogued under different old numbers — only one of which maps to 34423. Always match by serial number and diagram callout, not just by the old part number alone.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.