ICON - 33 Gallon RV Holding Tank - 56" x 36" x 5.5" - H3925 - Black/Gray Water

Upgrade your RV’s waste management with the ICON H3925 33-gallon holding tank, built from extra-thick, durable material to ensure long-lasting performance. Measuring 56" x 36" x 5.5", this tank is certified to IAPMO and CSA standards and features a preinstalled drain hub for easy installation. Designed for both black and gray water, it’s the reliable choice for straightforward replacement or added capacity.
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The ICON H3925 33-Gallon RV Holding Tank solves the most critical waste management challenge for RV owners: finding a durable, reliable replacement tank that fits perfectly and lasts for years without leaks or failures. Measuring 56" x 36" x 5.5", this low-profile holding tank is engineered with extra-thick material construction that far exceeds standard tank durability, making it ideal for black water, gray water, or dual-purpose applications in Class A motorhomes, fifth wheels, and travel trailers.

Features & Specifications

• 33-Gallon Capacity - Generous holding capacity for extended trips without frequent dumping
• Extra-Thick Material Construction - Engineered with thicker walls than standard tanks for superior durability and leak resistance
• Preinstalled Drain Hub & Level Sensors - Factory-installed fittings and sensors save installation time and ensure proper operation
• IAPMO & CSA Certified - Meets rigorous industry standards for safety, quality, and performance
• Low-Profile Design - 5.5" height fits tight spaces and low-clearance installations
• Dual-Purpose Use - Suitable for black water, gray water, or combined waste applications
• Lightweight Yet Durable - 29 lbs empty weight for easier handling during installation

Why Choose the ICON H3925 Holding Tank?

When your RV's holding tank fails, you need a replacement that fits perfectly, installs easily, and lasts for years without issues. The ICON H3925 33-gallon holding tank delivers professional-grade quality with extra-thick material construction that resists cracking, warping, and stress failures common in cheaper tanks. The preinstalled drain hub and level sensors eliminate the guesswork and extra work of drilling holes and installing fittings yourself, while IAPMO and CSA certifications guarantee this tank meets the highest industry standards for safety and performance. The low-profile 5.5" height makes this tank perfect for installations where vertical clearance is limited, such as under slideouts or in basement storage areas. Whether you're replacing a failed tank, upgrading to higher capacity, or building a custom RV, this ICON holding tank provides the reliability and durability that serious RVers demand.

Compare ICON RV Holding Tanks

Choosing the right holding tank depends on your RV's available space and capacity needs. Compare our complete range of ICON holding tanks to find the perfect fit:

💡 Pro Tip: Measure your RV's tank compartment carefully before ordering. The H3925's low 5.5" height makes it ideal for installations under slideouts or in tight vertical spaces, while the 56" x 36" footprint requires adequate floor space. Always verify clearance for drain fittings and sensor wiring.

Technical Specifications

• Part Number: H3925
• SKU: 15049
• Capacity: 33 gallons
• Dimensions (L x W x H): 56" x 36" x 5.5"
• Empty Weight: 29 lbs
• Material: Extra-thick high-density polyethylene (HDPE)
• Color: Black
• Drain Hub: Preinstalled (standard 3" fitting)
• Level Sensors: Preinstalled (4-level monitoring system)
• Certifications: IAPMO & CSA certified
• Application: Black water, gray water, or dual-purpose
• Compatible RV Types: Class A motorhomes, fifth wheels, travel trailers
• Manufacturer: ICON Direct
• Country of Origin: USA

What's Included

• One (1) ICON H3925 33-Gallon RV Holding Tank
• Preinstalled drain hub with 3" fitting
• Preinstalled 4-level sensor system
• IAPMO & CSA certification documentation
• 30-day return policy from Elkhart RV Parts
• Note: Drain valves, hoses, and mounting hardware sold separately

Compatible Models & Alternatives

This tank is designed for RVs requiring a low-profile 33-gallon holding tank with a 56" x 36" footprint. It's commonly used in Class A motorhomes, large fifth wheels, and travel trailers with basement storage areas. For different capacity or dimension requirements, see the comparison table above for alternative ICON holding tanks. Browse our complete selection of ICON RV tanks and plumbing components for additional options.

Frequently Asked Questions

What's the difference between black water and gray water tanks?

Black water tanks hold waste from the toilet, while gray water tanks collect wastewater from sinks and showers. This ICON H3925 tank can be used for either application or as a dual-purpose tank. The extra-thick material construction and preinstalled sensors work equally well for both black and gray water systems.

Are the drain hub and sensors already installed?

Yes, the ICON H3925 comes with a preinstalled drain hub (standard 3" fitting) and a complete 4-level sensor system. This saves significant installation time and ensures proper placement and sealing of critical components. You'll still need to connect your drain valve, plumbing, and sensor wiring during installation.

Will this tank fit my RV?

The H3925 measures 56" x 36" x 5.5" and requires adequate floor space and clearance for installation. Measure your RV's tank compartment carefully, accounting for drain fittings, sensor wiring, and mounting hardware. The low 5.5" height makes this tank ideal for installations where vertical clearance is limited, such as under slideouts or in basement storage areas.

How is this tank better than standard holding tanks?

ICON tanks feature extra-thick material construction that provides superior durability and leak resistance compared to standard tanks. The thicker walls resist cracking, warping, and stress failures, while IAPMO and CSA certifications guarantee the tank meets rigorous industry standards. Preinstalled fittings and sensors also ensure proper installation and reliable operation.

Can I install this tank myself?

While experienced RVers with proper tools can install holding tanks, professional installation is recommended for safety and warranty purposes. Installation involves removing the old tank, positioning the new tank, connecting drain plumbing, wiring sensors to your monitor panel, and securing the tank with mounting straps or brackets. Improper installation can lead to leaks, sensor failures, or tank damage.

What maintenance does this holding tank require?

Regular maintenance includes using RV-safe toilet paper and holding tank treatments, flushing the tank thoroughly after dumping, and inspecting drain fittings and sensors periodically for leaks or damage. The extra-thick material construction and quality fittings minimize maintenance needs, but proper care extends tank life and prevents odors and clogs.

Why Buy from Elkhart RV Parts?

Elkhart RV Parts is your authorized source for genuine ICON RV holding tanks and plumbing components. We stock authentic OEM parts directly from ICON Direct, ensuring you receive factory-quality tanks engineered for your specific application. Every order is backed by our 30-day return policy and ships quickly from our Indiana warehouse. Our team specializes in RV systems and can help you select the right holding tank for your RV's dimensions and capacity requirements.