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Elkhart Plastics 30 Gallon RV Holding Tank - EPI 4339 / H1259000
The Elkhart Plastics EPI 4339 (H1259000) is a premium 30-gallon black polyethylene holding tank engineered for superior waste water storage in RVs, travel trailers, and motorhomes. Manufactured by Elkhart Plastics, the industry's most trusted name in RV sanitation systems for over four decades, this tank delivers authentic OEM quality that matches or exceeds the original equipment installed by major RV manufacturers. With an ultra-low 6.125-inch height profile and seamless rotational molding construction, this tank is specifically designed for tight under-floor installations where vertical clearance is at a premium.
Measuring 60 inches long by 28 inches wide by just 6.125 inches tall, the EPI 4339 is one of the lowest-profile 30-gallon holding tanks available on the market. This makes it the ideal choice for RVs with shallow basement compartments, slide-out mechanisms, or limited vertical clearance. The 30-gallon capacity provides excellent waste storage for extended camping trips and boondocking adventures, while the compact height ensures it fits where standard tanks simply won't work. Whether you're replacing a damaged original tank or upgrading your RV's waste system, this Elkhart Plastics holding tank delivers the durability, reliability, and perfect fit you need.
Why Choose the Elkhart Plastics EPI 4339 Holding Tank?
Ultra-Low 6.125" Profile: At just over 6 inches tall, this is one of the lowest-profile 30-gallon holding tanks available. It's specifically engineered for installations where vertical space is extremely limited, such as under slide-outs, in shallow basement compartments, or beneath low-clearance floors. If you've struggled to find a tank that fits your tight space, the EPI 4339 is your solution.
Authentic OEM Quality: Elkhart Plastics has been the primary supplier for major RV manufacturers for decades. When you choose the EPI 4339, you're getting the exact same quality tank that comes factory-installed in new RVs from leading brands—not a cheap aftermarket substitute. This is genuine OEM equipment built to the highest industry standards with proven durability.
Seamless Roto-Molded Construction: Elkhart Plastics uses advanced rotational molding technology to create one-piece tanks with no seams, welds, or weak points. This manufacturing process produces uniform wall thickness throughout the entire tank, eliminating the stress concentrations and failure points common in cheaper welded or glued tanks. The result is superior strength and leak-free performance for years.
Maximum Capacity in Minimal Space: The 60x28-inch footprint maximizes storage capacity while the ultra-low 6.125-inch height minimizes vertical space requirements. This intelligent design gives you a full 30 gallons of waste storage without sacrificing precious under-floor clearance. It's the perfect balance of capacity and compact dimensions.
Chemical and Odor Resistant: The high-density black polyethylene construction resists degradation from RV holding tank chemicals, cleaners, and waste products. The material won't absorb odors or stains, and it maintains structural integrity even with continuous exposure to harsh tank treatments, sanitizers, and extreme pH levels.
Built for the Road: RV holding tanks endure constant vibration, temperature swings, and road shock. The EPI 4339 is engineered to handle these demanding conditions without cracking, warping, or developing leaks. The robust polyethylene material resists impact damage and maintains its shape even after years of travel on rough roads.
Technical Specifications
- Capacity: 30 gallons
- Dimensions: 60" L x 28" W x 6.125" H
- Part Numbers: EPI 4339, H1259000, H1259003
- Material: Black polyethylene
- Construction: Seamless rotational molded
- Weight: 25 lbs (empty)
- Color: Black
- Outlet: 3" termination fitting
- Manufacturer: Elkhart Plastics/Ameri-Kart
- Country of Origin: USA
- Application: RV gray water, black water holding tank
- Barcode: 51488827
- HS Code: 392510
Perfect Applications
This 30-gallon ultra-low-profile holding tank is ideal for a wide range of RV waste water applications where vertical clearance is limited. It's commonly used as a gray water tank for shower and sink drainage, or as a black water tank for toilet waste in travel trailers, fifth wheels, and motorhomes with shallow under-floor compartments. The 6.125-inch height makes it perfect for installations beneath slide-outs, in basement storage areas with limited headroom, and in custom RV builds where every inch of vertical space counts.
Many RV owners choose this tank when replacing damaged or leaking original equipment in popular RV brands. The EPI 4339 is a direct OEM replacement for numerous RV manufacturers and models, ensuring proper fit and function without modifications or custom fabrication. It's also popular in van conversions, custom RV builds, and mobile sanitation systems where reliable waste storage is critical but space is at a premium. The 30-gallon capacity provides adequate holding capacity for 3-5 days of typical use, making it perfect for weekend camping trips and extended boondocking adventures.
Compare Similar 30 Gallon Low-Profile Holding Tanks
| Model | Capacity | Dimensions (L x W x H) | Brand | Best For | View Details |
|---|---|---|---|---|---|
| Elkhart 4339/H1259 | 30 gallons | 60" x 28" x 6.125" | Elkhart Plastics | Ultra-low profile, maximum capacity | Current Product |
| Elkhart 2873/H1128 | 29 gallons | 60" x 28" x 7" | Elkhart Plastics | Same footprint, slightly taller | View Details |
| Elkhart 4273/H1256 | 30 gallons | 60" x 28" x 6" | Elkhart Plastics | Right end recessed drain | View Details |
| Elkhart 1433/H866 | 30 gallons | 54" x 22" x 8" | Elkhart Plastics | Smaller footprint, taller profile | View Details |
| MAKS 26x62x7 | 30 gallons | 26" x 62" x 7" | MAKS | Narrow width, longer length | View Details |
| Alpha 987BLANK | 30 gallons | 56" x 30" x 5.25" | Alpha | Lowest profile option (5.25" height) | View Details |
💡 Tip: When choosing a low-profile holding tank, measure your available vertical clearance carefully. The Elkhart 4339 at 6.125" height offers excellent capacity while fitting in extremely tight spaces.
Installation and Compatibility
Installing the Elkhart Plastics EPI 4339 is straightforward for anyone with basic RV maintenance skills or a qualified RV technician. Before installation, carefully measure your available mounting space to ensure proper fit—remember to account for the 3-inch drain fitting, vent connections, and mounting hardware which will add to the overall height requirement. The tank should be securely mounted using appropriate straps or brackets rated for the weight of a full tank (30 gallons of water weighs approximately 250 lbs) to prevent movement during travel.
This tank features a standard 3-inch termination fitting that's compatible with most RV waste systems, including standard drain valves, gate valves, and dump hose connections. For optimal performance and leak-free connections, we recommend using quality Elkhart Plastics tank fittings and accessories designed specifically for holding tank applications. Always use proper RV-grade sealants and follow manufacturer torque specifications when installing fittings to prevent leaks.
Frequently Asked Questions
What's the difference between this and the similar Elkhart tanks? The EPI 4339 (H1259000) has a 6.125" height, making it one of the lowest-profile 30-gallon options. The similar EPI 2873 (H1128) is 29 gallons at 7" height, while the EPI 4273 (H1256) is 30 gallons at 6" height with a right end recessed drain. Choose based on your exact space constraints and drain location requirements.
Will this tank fit my RV? The EPI 4339 is designed for installations where you have at least 60" length, 28" width, and 6.125" height clearance, plus additional room for fittings and connections. Measure your available space carefully, including clearance for the drain valve and vent pipe, to ensure proper fit.
Can I use this for both gray water and black water? Yes, this tank can be used for either gray water (sinks/showers) or black water (toilet waste) applications. The black polyethylene construction and seamless design make it suitable for both types of waste water storage. Just ensure you use it for one purpose only—never switch between gray and black water use.
How do I know if this is the right replacement for my damaged tank? Check your existing tank for part numbers—if you see EPI 4339, H1259000, or H1259003 stamped on the tank, this is an exact replacement. If you have different part numbers, measure your tank dimensions carefully (length, width, height) and note the drain location, then compare to this product's specifications.
What makes Elkhart Plastics tanks better than aftermarket alternatives? Elkhart Plastics manufactures OEM tanks for major RV brands including Forest River, Keystone, Thor, and many others. You're getting factory-quality equipment with seamless roto-molded construction, uniform wall thickness, and proven durability—not a thin-walled aftermarket imitation that will crack and fail prematurely.
Does this tank come with fittings and drain valves? This tank is sold as a blank tank without pre-installed fittings, allowing you to customize the fitting locations to match your specific RV plumbing configuration. You'll need to purchase fittings, drain valves, and vent connections separately based on your installation requirements.
Why Buy From Elkhart RV Parts?
When you order the Elkhart Plastics EPI 4339 from us, you're getting more than just a holding tank—you're getting peace of mind and expert support. We're an authorized dealer of genuine Elkhart Plastics products, which means you receive factory-fresh inventory with full manufacturer backing, not old stock or questionable aftermarket substitutes. Our team specializes exclusively in RV water and waste systems, and we understand the critical importance of reliable sanitation equipment for your RV lifestyle.
We offer fast, free shipping on this tank, and our expert packaging ensures it arrives in perfect condition ready for installation. Unlike big-box retailers who treat RV parts as an afterthought, we focus exclusively on RV components and understand the unique challenges of mobile waste systems. When you need technical support, fitment verification, or installation guidance, our AI Live Chat is available to provide expert assistance and answer your questions with deep product knowledge.
Ready to replace your failing holding tank with authentic OEM quality? Order your Elkhart Plastics EPI 4339 today and enjoy the confidence that comes with genuine factory equipment. With our fast shipping, expert support, and authorized dealer status, you'll be back on the road with a reliable waste system in no time.
| Material | Black polyethylene |
|---|---|
| Width (inches) | 28 |
| Height (inches) | 6.125 |
| Length (inches) | 60 |
| Capacity (gallons) | 30 |
| Wall thickness (inches) | 0.18 |
| Outlet diameter (inches) | 3 |
- What are the dimensions of the 30 gallon rv holding tank? The tank measures 60 inches in length, 28 inches in width, and 6 1/8 inches in height.
- What material is the 30 gallon rv holding tank made of? It is made of black polyethylene with a wall thickness of 0.180 inches.
- Does the tank come with fittings included? No, fittings are not included but can be added per quote.
- What is the purpose of the sealed hole on top of the tank? The sealed hole is a venting hole used during the manufacturing process and has no functional use for the end-user.
- Is this tank similar to any other models? Yes, it is very similar to tank #2872/H1129 and has the same configuration as tank #2873.
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.