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The H3658 RV holding tank is a verified ICON replacement tank built for RV black or gray water storage where the exact 84" x 20" x 10.88" footprint and extra long low profile layout matter. This 57 gallons tank helps you match the original installation more confidently while staying with OEM-grade construction and real product specs.
Features & Specifications
- Part number: H3658
- Capacity: 57 Gallons
- Overall dimensions: 84" x 20" x 10.88"
- Drain / configuration: extra long low profile
- Built for RV waste or holding tank replacement applications
- OEM-grade ICON construction with verified live-store specs
Why Choose H3658?
If you need a 57 gallons RV holding tank, the biggest win is matching the tank footprint and drain layout before you order. The H3658 makes that easier with a clearly identified part number, verified dimensions, and a format that fits common replacement searches for RV black-water and gray-water tank service.
Compare RV Holding Tanks
Not sure which RV holding tank is right for your setup? Compare capacity, footprint, and drain layout before you buy.
| Model | Capacity | Dimensions | Best For | View Details |
|---|---|---|---|---|
| H3658 | 57 Gallons | 84" x 20" x 10.88" | long narrow black or gray water replacement applications | Current Product |
| HT192B-ED | 39 Gallons | 70" x 24" x 8" | Mid-size center end drain waste tank replacement | View Details |
| HT192-ED | 54 Gallons | 70" x 24" x 11" | Higher-capacity center end drain waste tank replacement | View Details |
| HT706-ED | 15 Gallons | 46.5" x 16.5" x 8" | Smaller waste tank footprint alternative | View Details |
Tip: Match capacity, overall dimensions, and the exact drain position first. Small layout differences matter more than marketing wording.
Technical Specifications
- Brand: ICON
- Model: H3658
- Tank type: RV holding tank
- Dimensions: 84" x 20" x 10.88"
- Capacity: 57 Gallons
- Configuration: extra long low profile
What's Included
Tank only unless current product page verifies fittings or sensors.
Compatible Models & Alternatives
Compare this tank with other verified ICON holding tank options for similar capacities and footprints, including HT192B-ED, HT192-ED, and HT706-ED when you need a different size or drain layout.
Frequently Asked Questions
Is the H3658 the right RV holding tank for my application?
Match the part number, capacity, dimensions, and drain layout to your original tank before ordering.
Can this ICON tank be used for black or gray water?
These ICON waste and holding tank listings are written for RV replacement applications where black-water or gray-water storage is required, but you should still confirm your original setup.
Why do the dimensions matter so much on an RV waste tank?
Even small dimensional differences can affect fit, drain alignment, and clearance around mounting points or surrounding components.
Does this product include fittings or sensors?
Only the fittings, sensors, spigots, or valve details verified on the live product page should be treated as included.
Why Buy from Elkhart RV Parts?
Elkhart RV Parts focuses on verified RV replacement parts with factual listings, clear part identification, and live-store comparisons that help you avoid ordering the wrong tank.
Use AI Live Chat for a faster way to compare verified RV holding tank options before you order.
| QAI Certification | REC 559-1 |
|---|---|
| Part number | H3658 |
| Capacity (gallons) | 57 |
| Dimensions (inches) | 84 x 20 x 10.88 |
| Lead time | |
| Best for | Class A motorhomes and large fifth wheels |
- What are the dimensions of the icon holding tank h3658? The dimensions of the ICON Holding Tank H3658 are 84 inches in length, 20 inches in width, and 10.88 inches in height.
- What is the capacity of this holding tank? This ICON Holding Tank has a capacity of 57 gallons.
- Is this holding tank suitable for both black and gray water? Yes, the ICON Holding Tank can be used for black water, gray water, or a combination of both.
- Does this tank come with preinstalled fittings such as a drain or level sensors? Most ICON tanks come with preinstalled drains and level sensors, but please check the product image carefully to confirm for this specific model.
- Is the icon holding tank certified for quality and safety? Yes, ICON Holding Tanks are certified to IAPMO and CSA standards, ensuring quality and safety.
Factory-Fresh OEM Parts — the same brands installed in new RVs straight from Elkhart. Genuine, name-brand components made to order — never generic, never outdated. Sourced directly from the original RV manufacturers for perfect fit and factory-level quality.