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Looking for a reliable replacement holding tank for your 2013 Mercedes Freespirit 22SS? The ICON 20 Gallon RV Holding Tank H3979 delivers professional-grade waste storage with enhanced durability that outlasts standard tanks. Engineered with thicker 0.180" wall construction and certified to IAPMO and CSA standards, this tank provides leak-free performance for both black water and gray water applications.
Features & Specifications
- 20 Gallon Capacity - Optimal waste storage for extended trips without frequent dumping
- Dimensions: 28" L x 21" W x 18" H - Precision-fit for Mercedes Freespirit 22SS chassis
- Enhanced Wall Thickness: 0.180" rotomolded polyethylene for superior strength and puncture resistance
- IAPMO & CSA Certified - Meets North American plumbing and safety standards
- Dual Application: Suitable for black water, gray water, or combination systems
- Direct OEM Replacement: Replaces Triple E B50567 part number
- UV & Chemical Resistant: Black polyethylene construction withstands harsh RV environments
Why Choose the ICON 20 Gallon Holding Tank H3979?
Standard RV holding tanks often fail due to thin walls, poor material quality, and inadequate engineering. The ICON H3979 solves these problems with commercial-grade construction that's built to last. The thicker 0.180" walls resist cracking and warping even in extreme temperatures, while the seamless rotomolded design eliminates weak points where leaks typically develop. IAPMO and CSA certifications ensure this tank meets rigorous safety and performance standards, giving you confidence in your RV's waste management system. Whether you're replacing a damaged tank or upgrading from a failing unit, the ICON H3979 delivers reliable, worry-free operation for years to come.
Compare 20 Gallon RV Holding Tanks
Not sure which 20 gallon holding tank is right for your RV? Compare the ICON H3979 with similar capacity tanks to find the perfect fit for your specific dimensions and application.
| Model | Capacity | Dimensions | Best For | View Details |
|---|---|---|---|---|
| ICON H3979 B50567 | 20 Gallons | 28" x 21" x 18" | Mercedes Freespirit 22SS, taller profile applications | Current Product |
| Elkhart 0189H H1320 | 19 Gallons | 40" x 14" x 11" | Long narrow spaces, low-profile installations | View Tank → |
| Elkhart 3366 H1236 | 23 Gallons | 56" x 16" x 8" | Extra-long low-profile spaces, slide-out compartments | View Tank → |
| EPI 4478 (Discontinued) | 20 Gallons | 60" x 20" x 6" | Ultra-low profile, very long chassis applications | View Tank → |
Pro Tip: Always measure your available space carefully before ordering. The ICON H3979's taller 18" height makes it ideal for vertical installations where floor space is limited but you have adequate clearance above.
Technical Specifications
- Capacity: 20 Gallons (75.7 Liters)
- Length: 28 inches
- Width: 21 inches
- Height: 18 inches
- Wall Thickness: 0.180 inches (4.57mm)
- Material: High-density polyethylene (HDPE), black
- Construction: Seamless rotational molding
- Weight: 20 lbs (empty)
- Certifications: IAPMO, CSA
- Compatible Applications: Black water, gray water, combination systems
- OEM Part Numbers: H3979, B50567 (Triple E)
- Specific Fit: 2013 Mercedes Freespirit 22SS
What's Included
- 1x ICON 20 Gallon RV Holding Tank (H3979)
- Blank tank design allows custom fitting placement
- Manufacturer warranty coverage
- Installation instructions available upon request
Note: This is a blank tank without pre-installed fittings. You can position drain outlets, fill connections, and vent fittings exactly where your RV requires them. Fittings sold separately.
Compatible Models & Alternatives
The ICON H3979 is specifically engineered for the 2013 Mercedes Freespirit 22SS, but may also fit other RV models with similar dimensional requirements. If you need a different capacity or footprint, explore our complete selection of RV holding tanks or browse all ICON Direct products. For custom installations or unique applications, consider our range of tank fittings and accessories to complete your setup.
Frequently Asked Questions
How do I know if this tank will fit my RV?
This tank is designed specifically for the 2013 Mercedes Freespirit 22SS and replaces Triple E part number B50567. Measure your existing tank or available space carefully - you need at least 28" length x 21" width x 18" height clearance. If your dimensions differ, use our comparison table above to find alternative sizes.
Is this tank suitable for both black water and gray water?
Yes, the ICON H3979 is certified for both black water (toilet waste) and gray water (sink/shower drainage) applications. The seamless polyethylene construction and chemical-resistant material handle both waste types without degradation.
What fittings do I need to install this tank?
This is a blank tank, so you'll need to purchase fittings separately based on your specific plumbing configuration. Common requirements include a 3" drain fitting, fill connection, vent fitting, and mounting hardware. Browse our tank fittings collection for compatible options.
How does the 0.180" wall thickness compare to standard tanks?
The 0.180" wall thickness is significantly thicker than many economy RV holding tanks (which often use 0.125" or thinner walls). This extra material provides superior puncture resistance, better temperature tolerance, and longer service life - especially important for tanks mounted in exposed locations.
What's the lead time for this tank?
ICON tanks are custom-built to order with typical production times of 1-3 weeks. Check current availability and lead times at checkout or contact our team for the most accurate delivery estimate.
Can I use this tank in freezing temperatures?
While the polyethylene material itself can withstand freezing, we don't recommend using any RV holding tank in freezing conditions when filled with liquid. Always winterize your RV's plumbing system and drain all holding tanks before temperatures drop below 32°F to prevent damage.
Why Buy from Elkhart RV Parts?
As an authorized ICON Direct dealer, we guarantee 100% authentic OEM-grade parts backed by manufacturer warranties. Our team specializes in RV plumbing components and can help you select the right tank, fittings, and accessories for your specific application. We ship nationwide with fast, reliable delivery and offer expert technical support to ensure successful installation. Every ICON tank we sell is certified to meet IAPMO and CSA standards, giving you confidence in quality and safety.
Need Help Choosing the Right Tank?
Our AI Live Chat can help you find the perfect holding tank for your RV's specific dimensions and requirements. Get instant answers about compatibility, installation, and technical specifications.
PLEASE NOTE: All returns are subject to approval.
| Width (inches) | 21 |
|---|---|
| Height (inches) | 18 |
| Length (inches) | 28 |
| Weight (pounds) | 20 |
| Capacity (gallons) | 20 |
| Material thickness | thicker amount of material |
- What is the capacity of the icon holding tank h3979? The ICON Holding Tank H3979 has a capacity of 20 gallons.
- Is the icon 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 holding tank come with preinstalled fittings? Most ICON tanks have a preinstalled drain and level sensors, but it is recommended to view the product image carefully before ordering to ensure the correct selection.
- What vehicles is the icon holding tank h3979 designed to fit? This tank replaces the Triple E B50567 and is designed to fit the 2013 Mercedes Freespirit 22SS.
- What certifications does the icon holding tank have? The ICON Holding Tank is certified to IAPMO and CSA standards.
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.