ICON - 81 Gallon RV Fresh Water Tank - 44 1/2" x 58" x 7 3/4" - WT3644
The 81 gallon RV fresh water tank from ICON is built for RV owners replacing a cracked factory tank or planning a custom water layout around exact measurements. The WT3644 gives you a large-capacity, OEM-grade tank-only option without pre-installed fittings, probes, or sensors, so you can match the footprint first and finish the plumbing to your setup.
Its low-profile 44 1/2" x 58" x 7 3/4" design is especially useful when you have floor space available but limited height. If you need a blank RV fresh water tank that prioritizes capacity and layout flexibility, this is the style to look at first.
Features & Specifications
- ICON WT3644 81 gallon RV fresh water tank for replacement or custom-install work.
- Measures 44 1/2" x 58" x 7 3/4" for a wide, low-profile footprint.
- Blank tank-only configuration with no fittings, probes, or sensors installed.
- Durable roto-molded one-piece polyethylene construction.
- IAPMO certified for quality and safety standards.
- Good fit when you want to choose your own plumbing layout instead of working around pre-installed ports.
Why Choose ICON WT3644?
This 81 gallon RV fresh water tank works well for buyers who care more about matching tank dimensions than buying a one-size-fits-all layout. Because WT3644 is a blank tank-only design, you can plan your own filler, vent, and plumbing approach around the space you actually have.
That makes this 81 gallon RV fresh water tank a smart option for custom builds, older RV tank replacement projects, and low-profile water storage applications where capacity still matters. It also removes the risk of paying for pre-installed fittings that do not line up with your rig.
Compare Fresh Water Tanks
Not sure which RV fresh water tank is the right fit? Compare this ICON tank-only option against nearby capacities and footprints in our catalog.
| Model | Capacity | Dimensions | Best For | View Details |
|---|---|---|---|---|
| ICON WT3644 - Part WT3644 | 81 gallons | 44 1/2" x 58" x 7 3/4" | Large-capacity blank tank for replacement jobs and custom plumbing layouts. | Current Product |
| ICON WT3555 - Part WT3555 | 75 gallons | 50" x 36" x 10" | Slightly lower capacity when you can accept more height and need a shorter footprint. | View Details |
| ICON WT3835 - Part 2010371 | 52 gallons | 54" x 45" x 5 1/2" | Lower-profile installations where height is tighter and full 81-gallon capacity is not required. | View Details |
| ICON WT3676 - Part 2015555 | 106 gallons | 66" x 47 1/2" x 8" | Bigger-capacity builds with more floor space and a larger water reserve goal. | View Details |
Tip: For RV fresh water tank selection, match length, width, and height before capacity. A slightly smaller tank that fits cleanly is usually better than a larger tank that forces plumbing compromises.
Technical Specifications
| Brand | ICON |
| Model Number | WT3644 |
| Product Type | Fresh Water Tank |
| Capacity | 81 gallons |
| Dimensions | 44 1/2" x 58" x 7 3/4" |
| Configuration | Tank only / blank tank |
| Fittings | None included |
| Probes / Sensors | None included |
| Material | Polyethylene |
| Construction | Roto-molded, one piece |
| Certification | IAPMO certified |
| Shipping | LTL / freight |
What's Included
- 1 x ICON WT3644 81 gallon RV fresh water tank
- Blank tank configuration with no fittings installed
- No probes or sensors included
Compatible Models & Alternatives
If you are comparing footprints, capacities, or low-profile alternatives, these verified in-store options are a good next step:
- ICON WT3555 75 Gallon Tank Only for a smaller-capacity alternative with a shorter footprint.
- ICON WT3835 52 Gallon Fresh Water Tank for lower-profile applications.
- ICON WT3676 106 Gallon Fresh Water Tank for larger-capacity builds.
Frequently Asked Questions
No. WT3644 is a blank tank-only listing, so fittings, probes, and sensors are not pre-installed.
This RV fresh water tank measures 44 1/2" x 58" x 7 3/4".
Yes, especially when you need to replace a damaged fresh water tank and must match the footprint closely before drilling or plumbing.
It has a relatively low 7 3/4" height, which can help in installations where floor space is available but vertical room is limited.
Compare the exact length, width, height, and blank-tank configuration against your available space and planned plumbing layout before ordering.
Why Buy from Elkhart RV Parts?
Elkhart RV Parts focuses on hard-to-find RV parts and replacement components that buyers actually need help identifying correctly. For products like WT3644, that matters because dimensions, configuration, and application are often more important than generic marketing copy.
This listing also keeps the important facts upfront: 81 gallon capacity, exact dimensions, blank tank-only configuration, and verified in-store alternatives. The product currently carries a 4.8 out of 5 review average from verified reviews on the store.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The 81 gallon RV fresh water tank from ICON is built for RV owners replacing a cracked factory tank or planning a custom water layout around exact measurements. The WT3644 gives you a large-capacity, OEM-grade tank-only option without pre-installed fittings, probes, or sensors, so you can match the footprint first and finish the plumbing to your setup.
Its low-profile 44 1/2" x 58" x 7 3/4" design is especially useful when you have floor space available but limited height. If you need a blank RV fresh water tank that prioritizes capacity and layout flexibility, this is the style to look at first.
Features & Specifications
- ICON WT3644 81 gallon RV fresh water tank for replacement or custom-install work.
- Measures 44 1/2" x 58" x 7 3/4" for a wide, low-profile footprint.
- Blank tank-only configuration with no fittings, probes, or sensors installed.
- Durable roto-molded one-piece polyethylene construction.
- IAPMO certified for quality and safety standards.
- Good fit when you want to choose your own plumbing layout instead of working around pre-installed ports.
Why Choose ICON WT3644?
This 81 gallon RV fresh water tank works well for buyers who care more about matching tank dimensions than buying a one-size-fits-all layout. Because WT3644 is a blank tank-only design, you can plan your own filler, vent, and plumbing approach around the space you actually have.
That makes this 81 gallon RV fresh water tank a smart option for custom builds, older RV tank replacement projects, and low-profile water storage applications where capacity still matters. It also removes the risk of paying for pre-installed fittings that do not line up with your rig.
Compare Fresh Water Tanks
Not sure which RV fresh water tank is the right fit? Compare this ICON tank-only option against nearby capacities and footprints in our catalog.
| Model | Capacity | Dimensions | Best For | View Details |
|---|---|---|---|---|
| ICON WT3644 - Part WT3644 | 81 gallons | 44 1/2" x 58" x 7 3/4" | Large-capacity blank tank for replacement jobs and custom plumbing layouts. | Current Product |
| ICON WT3555 - Part WT3555 | 75 gallons | 50" x 36" x 10" | Slightly lower capacity when you can accept more height and need a shorter footprint. | View Details |
| ICON WT3835 - Part 2010371 | 52 gallons | 54" x 45" x 5 1/2" | Lower-profile installations where height is tighter and full 81-gallon capacity is not required. | View Details |
| ICON WT3676 - Part 2015555 | 106 gallons | 66" x 47 1/2" x 8" | Bigger-capacity builds with more floor space and a larger water reserve goal. | View Details |
Tip: For RV fresh water tank selection, match length, width, and height before capacity. A slightly smaller tank that fits cleanly is usually better than a larger tank that forces plumbing compromises.
Technical Specifications
| Brand | ICON |
| Model Number | WT3644 |
| Product Type | Fresh Water Tank |
| Capacity | 81 gallons |
| Dimensions | 44 1/2" x 58" x 7 3/4" |
| Configuration | Tank only / blank tank |
| Fittings | None included |
| Probes / Sensors | None included |
| Material | Polyethylene |
| Construction | Roto-molded, one piece |
| Certification | IAPMO certified |
| Shipping | LTL / freight |
What's Included
- 1 x ICON WT3644 81 gallon RV fresh water tank
- Blank tank configuration with no fittings installed
- No probes or sensors included
Compatible Models & Alternatives
If you are comparing footprints, capacities, or low-profile alternatives, these verified in-store options are a good next step:
- ICON WT3555 75 Gallon Tank Only for a smaller-capacity alternative with a shorter footprint.
- ICON WT3835 52 Gallon Fresh Water Tank for lower-profile applications.
- ICON WT3676 106 Gallon Fresh Water Tank for larger-capacity builds.
Frequently Asked Questions
No. WT3644 is a blank tank-only listing, so fittings, probes, and sensors are not pre-installed.
This RV fresh water tank measures 44 1/2" x 58" x 7 3/4".
Yes, especially when you need to replace a damaged fresh water tank and must match the footprint closely before drilling or plumbing.
It has a relatively low 7 3/4" height, which can help in installations where floor space is available but vertical room is limited.
Compare the exact length, width, height, and blank-tank configuration against your available space and planned plumbing layout before ordering.
Why Buy from Elkhart RV Parts?
Elkhart RV Parts focuses on hard-to-find RV parts and replacement components that buyers actually need help identifying correctly. For products like WT3644, that matters because dimensions, configuration, and application are often more important than generic marketing copy.
This listing also keeps the important facts upfront: 81 gallon capacity, exact dimensions, blank tank-only configuration, and verified in-store alternatives. The product currently carries a 4.8 out of 5 review average from verified reviews on the store.
