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The 30 Gallon RV Black Holding Tank from Alpha is a low-profile replacement waste tank for RV black-water or gray-water systems where the original tank footprint is close to 54" x 21.5" x 8". Use this tank when you need to replace a cracked, leaking, or aging holding tank and the capacity, dimensions, and fitting layout match your coach.
Alpha part VB22548H is built from rotationally molded polyethylene for a seamless, durable shell that can handle normal RV road vibration and waste-system use. Before ordering, measure your existing tank carefully and compare the length, width, height, outlet location, and available clearance.
Features & Specifications
- Capacity: 30 gallons for RV waste-water storage.
- Dimensions: 54" L x 21.5" W x 8" H.
- Part number: Alpha VB22548H; Shopify SKU VB22548HBLANK.
- Construction: rotationally molded polyethylene with a seamless one-piece tank body.
- Application: replacement RV holding tank for black-water or gray-water systems when dimensions and fitting layout match.
- Certification: QAI REC 559-1 listed in product data.
- Shipping weight: approximately 56 lb.
Why Choose This Alpha 30 Gallon Holding Tank?
Holding tanks are one of those RV parts where close is not good enough. A tank that is the wrong height may not clear the frame, and a tank with the wrong footprint can put the outlet or supports in the wrong place. This Alpha 30 gallon RV holding tank is a strong match when you need a wide, low 54" x 21.5" x 8" replacement instead of a taller or narrower tank.
The rotationally molded design helps avoid seams that can split under road vibration. It is a practical choice for DIY owners, RV technicians, and repair shops replacing a failed waste tank while keeping the original RV plumbing layout as close as possible.
Compare 30 Gallon RV Holding Tanks
Not sure which Alpha holding tank is right for your RV? Start with capacity, then match the physical dimensions and drain/fitting position to your existing tank.
| Model | Capacity | Dimensions | Best For / Application | View Details |
|---|---|---|---|---|
| Alpha VB22548H | 30 gal | 54" x 21.5" x 8" | Current product; low-profile 30 gallon Alpha replacement tank | Current Product |
| Alpha VB23528HL | 30 gal | 52" x 23" x 8" | Similar 30 gallon footprint with a slightly shorter, wider tank body | View Details |
| Alpha VB23528HR | 30 gal | 52" x 23" x 8" | Alternate right-hand version when your original outlet orientation requires it | View Details |
| Alpha VR22548HBLANK | 30 gal | 54" x 22" x 8.5" | Close Alpha alternative when you have slightly more width and height clearance | View Details |
| Alpha 260BLANK | 29.5 gal | 56" x 12" x 12" | Narrower, taller replacement space where a wide 21.5" tank will not fit | View Details |
Tip: Match the tank by measurements first, then confirm the fitting layout. Capacity alone is not enough to guarantee fit.
Technical Specifications
| Brand | Alpha |
| Manufacturer Part Number | VB22548H |
| SKU | VB22548HBLANK |
| Capacity | 30 gallons |
| Dimensions | 54" L x 21.5" W x 8" H |
| Material | Rotationally molded polyethylene |
| Use | RV black-water or gray-water holding tank replacement |
| Certification | QAI REC 559-1 |
What's Included
- One Alpha VB22548H 30 gallon RV holding tank.
- Installation hardware, fittings, straps, valves, sensors, and plumbing adapters are not included unless shown or listed separately.
- Inspect your existing setup before ordering so you know which fittings or sealants need to be reused or purchased separately.
Compatible Models & Alternatives
This tank is for RVs that can use a 30 gallon holding tank with a 54" x 21.5" x 8" footprint. It is not universal for every RV. If your original tank uses a different footprint, outlet position, or mounting clearance, choose the closest matching tank rather than forcing this one to fit.
- Browse the Alpha RV Holding Tanks page for more Alpha capacities and footprints.
- Use the RV Tank Finder if you are matching by dimensions instead of part number.
- Compare nearby 30 gallon options such as Alpha VB23528HL, Alpha VB23528HR, and Alpha VR22548HBLANK.
Frequently Asked Questions
How do I know if this 30 gallon RV black holding tank will fit?
Measure your existing tank and compare the full footprint: length, width, height, fitting layout, outlet location, and mounting clearance. A matching gallon rating does not guarantee the same shape.
Can this Alpha tank be used for black water or gray water?
Yes, this style of RV holding tank is commonly used in black-water or gray-water waste systems when the dimensions and plumbing layout match the RV.
Does this tank include valves, fittings, or sensors?
No. This listing is for the tank itself. Reuse compatible existing parts or purchase the correct valves, fittings, sensors, sealants, and mounting hardware for your installation.
What should I check before replacing an RV holding tank?
Check the part number if available, then confirm measurements, outlet placement, vent/inlet locations, mounting straps, and clearance around the frame. Take photos before removal so plumbing can be routed correctly during installation.
Is VB22548H the same as VB22548HBLANK?
VB22548H is the Alpha manufacturer part number. VB22548HBLANK is the Shopify SKU used for this listing and refers to this tank configuration.
Why Buy from Elkhart RV Parts?
Elkhart RV Parts focuses on hard-to-find RV replacement parts and tank matching, not generic hardware-store substitutes. That matters when you are trying to keep an RV repair moving and need the correct footprint, capacity, and part number the first time.
Use the AI Live Chat with your tank dimensions, part number, and photos of the current tank label or fitting layout so we can help point you toward the closest match.
| QAI Certification | REC 559-1 |
|---|---|
| Part number | VB22548H |
| Capacity (gallons) | 30 |
| Dimensions (inches) | 54 x 21.5 x 8 |
| Lead time | |
| Best for | RV waste management and storage |
- What is the capacity of the alpha black holding tank? The Alpha black holding tank has a capacity of 30 gallons.
- What are the dimensions of this holding tank? The holding tank measures 54 inches in length, 21 1/2 inches in width, and 8 inches in height.
- Is this holding tank compatible with most rvs? Yes, this tank is an authentic OEM part used in new RV builds by major manufacturers, ensuring perfect compatibility and performance.
- How durable is the construction of this holding tank? The tank is made using extra durable rotational molded construction, creating a seamless, one-piece tank that provides superior strength and longevity.
- Has the tank been tested for leaks before shipping? Yes, every tank is individually submerged and tested for leaks before shipping to guarantee a reliable, problem-free installation.
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.