Home / Recreation / Portable Toilet Water Tank Cap 35804 Portable Toilet Water Tank Cap 35804Price Not Available Price may not be up-to-date. Out of Stock View Product Part Number: 35804 Brand: FIDELITONE (THETFORD CORP.) Seller: Sears PartsDirect Category: Recreation Possible Matches$11.17FEL-PRO 35804 Water Pump Gasket Description This water tank cap (part number 35804) is for portable toilets. Water tank cap 35804 prevents water leaks from the tank.