Monaco Cayman 36 Fresh Water Tank Replacement & Capacity Guide

ICON’s current WT3855 page describes a nominal 26-US-gallon tank, not a replacement established for the reported 92-gallon Monaco system. A tank in that capacity range would not preserve the reported 92-gallon capacity. That comparison does not identify the original tank or prove physical compatibility with a Monaco Cayman 36; the coach year, floorplan and exact tank part number remain unconfirmed.

The current WT3855 catalog listing uses native SKU 14887 and calls it “Tank Only,” while ICON describes 14887 for certain Forest River #3847 applications with specifically placed fittings. Do not assume the supplied fittings, sensors or blank configuration from the title. ICON lists 50¾ × 22¾ × 5¾ inches, but its dimensioned image also shows a 7⅜-inch overall height. Review the complete shape, protrusions, orientation and finished envelope rather than using the nominal height alone. The catalog’s 26.4-gallon wording and manufacturer’s nominal 26-gallon wording do not establish a different large-capacity tank.

To identify a replacement, record the exact coach year/floorplan and the original tank’s molded manufacturer/part number, measure its complete shape and mounting envelope, and document fill, vent, outlet, drain, sensor and support locations. Compare those details with the exact manufacturer drawing and final supplied configuration, including potable-water suitability. Capacity, coach name or a “closest” footprint alone is not a fit confirmation. No particular 43-, 90-, 92- or 100-gallon replacement, custom configuration, stock or sourcing outcome is established by this question.