Replace 2003 Beaver Monterey Seacliff 100 Gallon Fresh Water Tank

Asked by David from Hudson, FloridaAsked on March 15, 2026Answered by Elkhart RV Parts
Verified Purchase Customer Kept This Part Purchased: Elkhart Plastics - 29 Gallon RV Holding Tank 45x15.5x12.375 - H1296 Black Gray Water Tank, Universal Holding Tank Fittings Kit w/ Level Sensors for Black Water and Grey Water RV Tanks
Customer Question

I own a 2003 Beaver Monterey Seacliff with a deformed 100-gallon fresh water tank measuring 75 x 27.5 x 10 inches. I need to replace the tank and am looking for suitable replacement options.

Expert Answer

The original OEM fresh water tank for your 2003 Beaver Monterey Seacliff is no longer available. However, you can replace it with a universal fresh water tank that fits your space and capacity needs. We recommend considering these durable roto-molded polyethylene tanks: the Alpha Systems 60 Gallon (55 x 36 x 9 inches), Elkhart Plastics 39 Gallon low profile tank, or Elkhart Plastics 78 Gallon (43 x 29 x 15 inches). Before purchasing, confirm your available space dimensions and desired capacity to ensure a proper fit. These tanks are commonly used replacements when OEM parts are unavailable and provide reliable performance for your fresh water system.

Product Comparison

Feature Alpha Systems 60 Gallon Elkhart Plastics 39 Gallon Elkhart Plastics 78 Gallon
Capacity 60 gallons 39 gallons 78 gallons
Dimensions (L×W×H) 55 x 36 x 9 inches Not specified (low profile) 43 x 29 x 15 inches
Material Roto-molded polyethylene Roto-molded polyethylene Roto-molded polyethylene
Compatibility Universal replacement Universal replacement Universal replacement
Use Case Suitable for most 60-100 gal spaces Suitable for limited height spaces Larger capacity replacement

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