The Elkhart Plastics 30 Gallon RV Holding Tank (EPI 4414 / H1238000) is a direct OEM-grade replacement for black water and gray water systems in a wide range of recreational vehicles. At 62" x 26" x 6.75", this low-profile tank is engineered for tight undercarriage spaces where standard-depth tanks simply won't fit.

Features & Specifications

• Capacity: 30 gallons
• Dimensions: 62" x 26" x 6.75" (L x W x H)
• Part Numbers: EPI 4414 / H1238000
• Wall Thickness: 0.180" black high-density polyethylene (HDPE)
• Outlet: Standard 3" outlet included
• Construction: Seamless roto-molded — equal wall thickness, no weak spots
• Compliance: Manufactured to meet quality and health safety standards
• Country of Origin: USA

Why Choose the EPI 4414 / H1238000 Holding Tank?

Elkhart Plastics' roto-molding process creates a seamless, uniform-wall tank that resists road vibration, impacts, and the corrosive nature of waste water. Unlike injection-molded alternatives, there are no seams or weld lines to fail over time.

The 6.75" profile makes this 30 gallon RV holding tank one of the lowest-profile options available at this capacity — ideal for slide-outs, low-floor coaches, and fifth wheels with limited undercarriage clearance. The standard 3" outlet ensures compatibility with most RV plumbing configurations right out of the box.

Note: The sealed hole on top of the tank is from the manufacturing process — it is a venting hole used during roto-molding and has no functional use for the end user.

Compare 30 Gallon RV Holding Tanks

Not sure which tank fits your rig? Compare the EPI 4414 against similar-capacity Elkhart Plastics holding tanks below to find the right dimensions for your application.

Tip: Always measure your existing tank's footprint (L x W x H) before ordering. Even a 0.5" difference in height can affect fitment in low-clearance bays.

Technical Specifications

• Capacity: 30 gallons
• Length: 62"
• Width: 26"
• Height: 6.75"
• Wall Thickness: 0.180"
• Material: Black high-density polyethylene (HDPE)
• Outlet Size: 3" (standard)
• Manufacturing Process: Roto-molded (seamless)
• Part Numbers: EPI 4414, H1238000, H1238
• Weight: 25 lbs
• HS Code: 392510
• Country of Origin: USA

What's Included

• 1x Elkhart Plastics 30 Gallon RV Holding Tank (EPI 4414 / H1238000)
• Standard 3" outlet pre-installed
• Manufacturer quality certification

Note: Additional fittings, vents, and sensors are sold separately. This listing is for the blank tank with no additional fittings.

Compatible Models & Related Products

Looking for a different size or configuration? Browse our full selection of Elkhart Plastics holding tanks:

• 30 Gallon - EPI 4339 / H1259000 (60" x 28" x 6.125")
• 29 Gallon - EPI 2873 / H1128 (60" x 28" x 7")
• 29 Gallon - H1296 (45" x 15.5" x 12.375")

Frequently Asked Questions

What is the difference between EPI 4414 and H1238000?
These are the same tank — EPI 4414 is the Elkhart Plastics internal model number, while H1238000 is the distributor/OEM part number. Both refer to the identical 30 gallon, 62" x 26" x 6.75" tank.

Is this tank compatible with my RV?
This tank is a direct OEM replacement for any RV originally fitted with EPI 4414 or H1238000. Always verify your existing tank's dimensions (62" x 26" x 6.75") and outlet location before ordering.

How do I install a 30 gallon RV holding tank?
Installation typically involves draining and removing the existing tank, transferring fittings and sensors, and securing the new tank with the original straps or brackets. We recommend consulting your RV's service manual or a certified RV technician.

What is the sealed hole on top of the tank?
That hole is a manufacturing vent used during the roto-molding process. It is permanently sealed and has no functional purpose for the end user — it does not need to be connected to anything.

Can this tank be used for both black water and gray water?
Yes. This polyethylene tank is chemically compatible with both black water (toilet waste) and gray water (sink/shower drain) applications.

Where can I buy the EPI 4414 holding tank?
ElkhartRVParts.com is the authorized source for genuine Elkhart Plastics OEM tanks. Purchasing here ensures you receive an authentic, quality-certified part.

Why Buy from Elkhart RV Parts?

• Authorized Elkhart Plastics dealer — guaranteed authentic OEM parts
• USA-manufactured tanks with roto-molded seamless construction
• Expert product knowledge — we stock what we sell
• Competitive pricing with fast freight shipping
• Hassle-free returns and dedicated customer support