21 Gallon Marine Holding Tank

SKU: RH-B355
Fitting Package:** Required Fields
Please select an option
Part Number: RH-B355
Capacity: 21 Gallons
Dimensions: 53 1/2"L x 16 3/4"W x 6"H
Ships From: Tustin, CA  
Technical Drawings
Fitting DwgFitting Instructions Video

21 Gallon Marine Holding Tank - Septic & Waste

 RH-B355, 21 gallon marine holding tanks can be used for marine toilet (head) holding tanks, freshwater, greywater and blackwater situations.  

  • Polyethylene tanks generally retain less odors than aluminum or stainless steel tanks.
  • Rotomolded using FDA approved polyethylene plastic resin.
  • Tank dimensions can be rotated to meet your needs.
  • Marine Holding Tanks can be ordered 3 different ways to fit your needs: a Standard Holding Tank Fitting Package, a blank tank with no fittings installed, or a custom tank with fittings installed per your request (Any Location, Any Size)
  • Standard Holding Tank Fitting Package includes: a 1 1/2" Inlet, a 1 1/2" Outlet, and a 1/2" Vent

marine tank installation instructions
Part NumberRH-B355
Mfr. Part NumberB355
Capacity (Gallons)21
Dimensions53 1/2"L x 16 3/4"W x 6"H
Weight (lbs)30
Wall Thickness5/16" - 3/8"
ManufacturerRonco Plastics
Technical Drawings & Guides
Technical DrawingsFitting DwgFitting Instructions Video
Shipping FromTustin, CA
Freight Class150
Shipping Length54.5
Shipping Width17.75
Shipping Height8
Shipping Weight (lbs)30
Browse Related Products
6" Inspection Lid - White Collar, Clear Lid
6" Inspection Lid - White Collar, Clear Lid  
Part: R-DP60-W-C  


made in the usa