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The H3857 RV holding tank is a verified ICON replacement tank built for RV black or gray water storage where the exact 38.75" x 24" x 4.25" footprint and ultra low profile layout matter. This 12 gallons tank helps you match the original installation more confidently while staying with OEM-grade construction and real product specs.
Features & Specifications
- Part number: H3857
- Capacity: 12 Gallons
- Overall dimensions: 38.75" x 24" x 4.25"
- Drain / configuration: ultra low profile
- Built for RV waste or holding tank replacement applications
- OEM-grade ICON construction with verified live-store specs
Why Choose H3857?
If you need a 12 gallons RV holding tank, the biggest win is matching the tank footprint and drain layout before you order. The H3857 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 |
|---|---|---|---|---|
| H3857 | 12 Gallons | 38.75" x 24" x 4.25" | tight underfloor black or gray water 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: H3857
- Tank type: RV holding tank
- Dimensions: 38.75" x 24" x 4.25"
- Capacity: 12 Gallons
- Configuration: ultra low profile
What's Included
Preinstalled sensors when shown in current product details.
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 H3857 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 |
|---|---|
| Width (inches) | 24 |
| Height (inches) | 4.25 |
| Length (inches) | 38.75 |
| Weight (pounds) | 17 |
| Capacity (gallons) | 12 |
| Material thickness | thicker amount of material |
- What are the dimensions of the icon holding tank h3857? The dimensions of the ICON Holding Tank H3857 are 38.75 inches by 24 inches by 4.25 inches.
- What is the capacity of this holding tank? This ICON holding tank has a capacity of 12 gallons.
- Can this tank be used 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 the icon holding tank h3857 come with preinstalled fittings? Most ICON tanks come with preinstalled drain and level sensors, but it is recommended to view the product image carefully to confirm preinstalled fittings.
- Is the icon holding tank h3857 durable and reliable? Yes, the ICON holding tank is made with a thicker amount of material for a stronger build and is certified to IAPMO and CSA standards, ensuring durability and reliability.
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.