Mercury MerCruiser Quicksilver Quad Ring 20295 | 25-20295 | 1.725 x .210 in.
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Mercury / MerCruiser Quicksilver Quad Ring 20295
Part Number: 20295 | Service Format: 25-20295 | Size: 1.725 in. × 0.210 in. | Type: Quad ring | GTIN: 745061573154
Genuine Mercury / MerCruiser OEM quad-profile sealing ring used in selected MerCruiser and Mercury Racing closed-cooling / crossover assemblies. Mercury parts references identify 20295 specifically as the crossover-to-heat-exchanger seal on applicable high-performance engines, with two quad rings required per applicable assembly. A quad ring has a four-lobed cross-section that provides more sealing contact area than a standard O-ring of the same nominal size — do not substitute a round O-ring of the same dimensions. No confirmed newer OEM superseding number has been identified.
Specifications
- Brand: Mercury / MerCruiser / Quicksilver
- Part Number: 20295
- Service Format: 25-20295
- Type: Quad ring (X-ring / four-lobed cross-section)
- Outside Diameter / ID Reference: 1.725 in.
- Cross-Section: 0.210 in.
- Packed Dimensions: ~2.13 in. × 2.13 in. × 0.25 in.
- Weight: ~0.01 kg per unit
- GTIN / UPC: 745061573154
- System: Closed-cooling crossover / heat-exchanger sealing circuit
- Typical Quantity per Assembly: 2
Compatible Applications
Fitment must be confirmed against the Mercury parts diagram for your exact engine model, cooling-system configuration, and serial number. Mercury used several different seals in the same closed-cooling assembly area — the diagram part number is the only reliable match.
- Mercury Racing 520
- Mercury Racing 525 EFI — closed-cooling heat-exchanger / crossover assembly (qty 2)
- Mercury Racing 540
- Mercury Racing 565 EFI
- Mercury Racing 600 SCi
- Mercury Racing 662 SCi
- Mercury Racing 700 SCi
- MerCruiser 8.2L MAG — closed-cooling crossover assembly (verify by serial number)
- MerCruiser 8.2L MAG H.O. — closed-cooling crossover assembly (verify by serial number)
- MerCruiser 8.2L Inboard EC (selected serial ranges — verify by diagram)
Diagram Position & Assembly Context
On 525 EFI and 8.2L MAG closed-cooling systems, Mercury parts diagrams show the following seals in the same heat-exchanger / crossover area. These are separate, non-interchangeable parts — confirm each by its diagram position before ordering:
- 20295 — Quad Ring 1.725 × .210 in. — qty 2 — crossover-to-heat-exchanger seal
- 30529 — O-Ring 1.925 × .103 in. — separate position in the same assembly
- 8071341 — Thermostat seal — separate position
- 8M0039163 — Heat-exchanger O-ring — separate position
When to Replace
- The crossover or heat-exchanger joint is being opened for any reason
- Coolant seepage is present at the crossover fitting
- The ring is flattened, permanently compressed, cut, nicked, hardened, swollen, or cracked
- Best practice: replace all seals in the assembly during any major cooling-system service — reusing a compressed seal is a common source of post-service leaks
Installation Notes
- Clean the quad-ring groove and all mating surfaces thoroughly before installing the new seal
- Seat the quad ring evenly in the groove — do not twist, pinch, or roll it during assembly
- Lubricate with the coolant-compatible lubricant or sealant specified in the Mercury service manual for this assembly
- Verify both 20295 quad rings are correctly seated before closing the crossover / heat-exchanger joint
- Do not substitute a standard round O-ring — the quad-ring profile is specified for this sealing position
Related Parts & Service Items
- Mercury MerCruiser Quicksilver Thermostat Housing Gasket 806871
- MerCruiser Thermostat Cover Housing 8M0061068 — 454 / 502 Big Block
- MerCruiser Thermostat 991551
- Mercury Antifreeze -100°F 1 Gallon — 8M0073203 — for closed-cooling system service
- Mercury MerCruiser Quicksilver O-Ring 201951 — 0.487 × 0.103 in. — related OEM sealing ring
Parts Desk Insights
Best use case: 20295 is the right seal when you are opening the crossover-to-heat-exchanger connection on a closed-cooling MerCruiser or Mercury Racing engine. Order two — the diagram calls for one on each side of the fitting, and having both on hand before you start the job means no delays mid-service.
Common customer issue: Confusing 20295 with one of the other seals that sit nearby in the same assembly — particularly 30529 (a round O-ring, different size) or 8M0039163 (the heat-exchanger O-ring). They can look similar out of context, but each seats in a specific groove and is not interchangeable with the others. The closed-cooling diagram for your exact engine is the definitive reference — if you need help reading it, our parts desk can confirm which seal goes where before you order.
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.