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Need a compact holding tank for tight spaces? The Elkhart Plastics 9 Gallon RV Holding Tank EPI 450H delivers reliable waste storage in a space-efficient 22.5" x 16.5" x 9" footprint. With heavy-duty 0.180" black polyethylene construction and a 3" outlet, this tank provides professional-grade performance for black water or gray water applications in RVs, campers, and marine vessels where space is at a premium.
Features & Specifications
- 9 Gallon Capacity - Compact waste storage for small RVs, campers, and marine applications
- Compact Footprint: 22.5" L x 16.5" W x 9" H - Perfect for tight compartments and limited spaces
- Heavy-Duty Black Polyethylene - Durable material resists UV damage and chemical degradation
- Seamless One-Piece Construction - Rotomolded design eliminates weak joints and potential leak points
- Thick Walls: 0.180" thickness - Superior durability and puncture resistance
- 3" Outlet - Standard drain fitting size for easy connection to RV plumbing systems
- Dual Application: Suitable for black water (toilet waste) or gray water (sink/shower drainage)
- Blank Tank Design - Custom fitting placement allows precise configuration for your specific plumbing needs
Why Choose the Elkhart Plastics 9 Gallon EPI 450H?
Finding a reliable holding tank for compact RVs and campers can be challenging. The EPI 450H solves this problem with a carefully engineered 22.5" x 16.5" x 9" footprint that maximizes capacity while fitting in tight spaces where larger tanks won't work. The seamless rotomolded construction creates a single-piece tank with uniform 0.180" wall thickness and no weak seams where cracks typically develop. Black polyethylene construction provides superior UV resistance and chemical durability for long-lasting performance. Whether you're replacing a damaged tank or upgrading your waste management system, the EPI 450H delivers professional-grade reliability backed by Elkhart Plastics' reputation for quality.
Compare 9 Gallon RV Holding Tanks
Not sure which compact holding tank is right for your RV? Compare the EPI 450H with similar small-capacity options to find the perfect fit for your specific space constraints.
| Model | Capacity | Dimensions | Best For | View Details |
|---|---|---|---|---|
| Elkhart EPI 450H | 9 Gallons | 22.5" x 16.5" x 9" | Compact spaces, small RVs and campers | Current Product |
| Elkhart EPI 3772 (Discontinued) | 8 Gallons | 17.75" x 17.75" x 8.25" | Square footprint, slightly smaller capacity | View Tank → |
| Elkhart EPI 184H (Discontinued) | 12 Gallons | 22.75" x 15" x 7.5" | Similar length, narrower width, lower profile | View Tank → |
| Elkhart EPI 0199H (Discontinued) | 13 Gallons | 22" x 17" x 11" | Similar footprint, taller profile, more capacity | View Tank → |
Pro Tip: The 9 gallon capacity is ideal for weekend trips and short excursions in compact RVs. For extended trips, consider pairing with a larger tank or plan for more frequent dump station visits.
Technical Specifications
- Capacity: 9 Gallons (34.1 Liters)
- Length: 22.5 inches
- Width: 16.5 inches
- Height: 9 inches
- Material: Black polyethylene (UV and chemical resistant)
- Construction: Seamless one-piece rotational molding
- Wall Thickness: 0.180 inches (heavy-duty construction)
- Outlet Size: 3 inches (standard RV drain fitting)
- Application: Black water or gray water holding tank
- Color: Black
- Part Numbers: EPI 450H, H1260
- Vendor: Elkhart Plastics/Ameri-Kart
What's Included
- 9 Gallon RV Holding Tank (EPI 450H)
- Blank tank design allows custom fitting placement
- 3" outlet pre-molded into tank
- Manufacturer warranty coverage
Note: This is a blank tank with a 3" outlet. Additional fittings for fill connections, vents, and sensors can be positioned exactly where your RV requires them. Fittings sold separately.
Compatible Models & Alternatives
The EPI 450H's compact 22.5" x 16.5" x 9" dimensions make it ideal for small RVs, campers, pop-up trailers, and marine vessels where space is extremely limited. If you need a different capacity or footprint, explore our complete selection of RV holding tanks or browse all Elkhart Plastics products. For custom installations, consider our range of tank fittings and accessories to complete your setup.
Frequently Asked Questions
Will this tank fit in my compact RV?
The 22.5" x 16.5" x 9" dimensions make this tank ideal for tight spaces in small RVs and campers. Measure your available clearance carefully - you need at least 22.5" length x 16.5" width x 9" height.
Can this tank be used for both black water and gray water?
Yes, the EPI 450H is suitable for both black water (toilet waste) and gray water (sink/shower drainage) applications. The black polyethylene construction and chemical-resistant material handle both waste types without degradation.
What fittings do I need to install this tank?
This tank comes with a 3" outlet pre-molded. You'll need additional fittings for fill connections, vent fittings, and optional sensor fittings. Browse our tank fittings collection for compatible options.
How often will I need to empty a 9 gallon tank?
This depends on your usage, but a 9 gallon tank is best suited for weekend trips or short excursions with 1-2 people. For extended trips, you'll need to empty more frequently or consider a larger capacity tank.
Is the 0.180" wall thickness durable enough?
Yes, the 0.180" wall thickness is Elkhart Plastics' standard heavy-duty specification, providing excellent durability and puncture resistance. This is thicker than many economy tanks which often use 0.125" or thinner walls.
Can this tank be used in a marine application?
Absolutely! The compact design and durable black polyethylene construction make it perfect for boats, yachts, and other marine vessels where you need reliable waste storage in a limited space.
Why Buy from Elkhart RV Parts?
As an authorized Elkhart Plastics 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. Every Elkhart Plastics tank we sell is built to rigorous quality standards that ensure safe, reliable performance for years to come.
Need Help Finding the Right Compact Tank?
Our AI Live Chat can help you find the perfect holding tank for your specific space constraints and capacity requirements. Get instant answers about dimensions, compatibility, and installation.
| Material | black polyethylene |
|---|---|
| Width (inches) | 16.5 |
| Height (inches) | 9 |
| Length (inches) | 22.5 |
| Capacity (gallons) | 9 |
| Wall thickness (inches) | 0.18 |
| Outlet diameter (inches) | 3 |
- What are the dimensions of the 9 gallon rv holding tank? The tank measures 22 1/2 inches in length, 16 1/2 inches in width, and 9 inches in height.
- Does the 9 gallon rv holding tank come with fittings? No, the tank is sold blank with no fittings, but fittings can be added per quote.
- What material is the 9 gallon rv holding tank made from? It is made from black polyethylene with a wall thickness of 0.180 inches.
- Is the sealed hole on top of the tank functional? No, the sealed hole on top is a venting hole used during manufacturing and has no functional use for the end-user.
- How is the 9 gallon rv holding tank manufactured? The tank is manufactured using roto-molding, a process that creates a seamless tank with walls of equal thickness and no weak spots.
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.