ICON - 40 Gallon RV Holding Tank - 59" x 28" x 8" - H4141 - Mid-Size Black/Gray Water with Fittings

Upgrade your RV’s waste management with this durable 40-gallon ICON holding tank, built with extra-thick material for long-lasting performance. Preinstalled drain and level sensors make monitoring easy, while the versatile design is suitable for both black and gray water. Certified to IAPMO and CSA standards, it’s a reliable replacement or upgrade for your RV.
---

The ICON H4141 40 Gallon RV Holding Tank delivers reliable mid-size waste management in a 59" x 28" x 8" design perfect for Class A motorhomes, large fifth wheels, and travel trailers. Engineered with extra-thick polyethylene construction and preinstalled drain fittings, reducer, and level sensors, this IAPMO-certified tank provides durable black water or gray water storage with everything you need for installation. Whether you're replacing a damaged tank or upgrading your RV's waste capacity, the H4141 offers professional-grade quality with included fittings that save time and money.

Features & Specifications

• 40 Gallon Capacity: Mid-size waste storage ideal for extended trips and full-time RVing
• Complete Fitting Package: Includes 1.5" FPT drain fitting, 3"-1.5" reducer, and preinstalled level sensors
• Extra-Thick Material: Heavy-duty polyethylene construction resists cracking, warping, and chemical damage
• Preinstalled Sensors: Factory-installed level sensor probes eliminate custom drilling and installation time
• Dual-Purpose Application: Suitable for black water or gray water storage depending on your RV configuration
• IAPMO & CSA Certified: Meets rigorous North American safety and quality standards for RV holding tanks
• Versatile Dimensions: 59" x 28" x 8" footprint fits most mid-size to large RV underbelly compartments

Why Choose the ICON H4141 Holding Tank?

When you need a reliable 40-gallon holding tank with included fittings, the ICON H4141 delivers professional-grade quality and convenience. The extra-thick polyethylene construction provides superior durability compared to standard tanks, while the preinstalled sensors and included drain fittings save you hours of installation time and eliminate the need to source separate components. The 40-gallon capacity strikes the perfect balance between waste storage and underbelly space, making it ideal for RVers who take extended trips or live full-time in their rigs.

ICON Technologies has built a reputation for engineering holding tanks that outlast OEM replacements. The H4141's IAPMO and CSA certifications ensure you're getting a tank that meets strict safety standards for waste containment. Whether you're a DIY RV owner tackling a tank replacement or a mobile technician servicing customer rigs, the H4141 offers the perfect balance of capacity, quality, and included components that make installation faster and easier.

Compare ICON Holding Tanks

Not sure if the 40-gallon H4141 is the right size for your RV? Compare it against other ICON holding tanks with similar mid-size capacities to find the perfect fit for your underbelly space and waste capacity needs.

💡 Pro Tip: The H4141 includes a 1.5" FPT drain fitting and 3"-1.5" reducer, saving you $30-50 in separate fitting costs. If you need more capacity in the same footprint, consider the H3882 (44 gallons) with nearly identical dimensions.

Technical Specifications

• Part Number: H4141
• Manufacturer: ICON Technologies (Icon Direct)
• Capacity: 40 Gallons (151.4 Liters)
• Length: 59 inches
• Width: 28 inches
• Height: 8 inches
• Material: Extra-thick polyethylene (UV and chemical resistant)
• Construction: Seamless one-piece rotational molding
• Sensors: Preinstalled level sensor probes
• Included Fittings: 1.5" FPT drain fitting (1), 3"-1.5" reducer (1)
• Application: Black water or gray water holding tank
• Certifications: IAPMO and CSA certified
• Weight: Approximately 35-40 lbs (empty)
• Ideal For: Class A motorhomes, large fifth wheels, travel trailers with mid-size waste capacity needs

What's Included

• ICON H4141 40-gallon holding tank with preinstalled sensors
• 1.5" FPT (Female Pipe Thread) drain fitting (1)
• 3"-1.5" reducer fitting (1)
• Factory-installed level sensor probes
• IAPMO/CSA certification documentation
• Installation requires separate mounting hardware and additional plumbing connections (not included)

Note: This tank includes drain fittings and reducer to get you started. Additional fittings, valves, and mounting straps may be needed depending on your RV configuration. Browse our tank fittings collection for compatible accessories.

Compatible Models & Alternatives

The ICON H4141 fits many mid-size to large RV models with similar underbelly dimensions. If you're looking for related products or alternative tank sizes, explore these options:

• Browse all RV holding tanks - Complete selection of black water and gray water tanks
• Tank fittings and accessories - Valves, sensors, drain fittings, and mounting hardware
• All ICON Technologies products - Complete ICON catalog including fresh water tanks

Frequently Asked Questions

How do I know if the H4141 will fit my RV?

Measure your existing tank or underbelly compartment carefully. The H4141 requires a minimum space of 59" length x 28" width x 8" height. Check clearances around plumbing connections and mounting points. The included 1.5" FPT fitting and reducer provide flexibility for various plumbing configurations.

Can I use this tank for both black water and gray water?

Yes, ICON holding tanks are designed for dual-purpose use. You can use the H4141 for black water (toilet waste), gray water (sink/shower drainage), or a combination system depending on your RV's plumbing configuration. The extra-thick polyethylene construction and included fittings handle both applications.

What fittings are included with the H4141?

The H4141 comes with a 1.5" FPT (Female Pipe Thread) drain fitting, a 3"-1.5" reducer, and preinstalled level sensors. This saves you time and money compared to buying a blank tank and sourcing fittings separately. You may still need a gate valve, vent fitting, and inlet connection depending on your RV setup.

Is 40 gallons enough capacity for full-time RVing?

A 40-gallon holding tank is ideal for extended trips and full-time RVing for 1-2 people. For reference, a typical RV toilet flush uses about 0.5 gallons, so you'd get approximately 80 flushes before needing to dump. If you have a larger family or want more capacity, consider upgrading to the 44-gallon H3882 or 48-gallon HT543-ED.

How do I install the H4141 holding tank?

Installation requires removing your old tank, positioning the H4141 in the underbelly compartment, securing it with mounting straps or brackets, and connecting the included drain fitting to your gate valve, vent line, and inlet plumbing. The preinstalled sensors connect to your existing tank monitor wiring. Professional installation is recommended if you're not experienced with RV plumbing systems.

What makes ICON tanks better than standard replacement tanks?

ICON tanks are engineered with extra-thick polyethylene material (thicker than many OEM tanks), providing superior resistance to cracking, warping, and chemical damage. The seamless rotational molding process eliminates weak joints, and IAPMO/CSA certifications ensure the tank meets rigorous safety standards. The H4141 also includes fittings that would cost $30-50 separately, adding extra value.

Why Buy from Elkhart RV Parts?

As an authorized ICON Technologies dealer, Elkhart RV Parts guarantees 100% authentic OEM-grade holding tanks backed by manufacturer warranties. Our team specializes in RV plumbing components and can help you select the right tank size and configuration for your specific RV model. Every ICON tank we sell is built to rigorous IAPMO and CSA standards, ensuring safe and reliable waste management for years of RV adventures.