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Super Premium Holding Tank - 55 gallon

Odor-free Trionic marine holding tank, 40”x20”x19”. Heavy-duty 3/8” polyethylene, top fittings, relief valve & Coast Guard compliant design.

Reference: SP-55
$605.00

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The Trionic Super Premium Marine Holding Tank delivers the highest standard in odor-free, leakproof marine sanitation. Built from 100% virgin 3/8” wall polyethylene, this tank provides exceptional durability, corrosion resistance, and long-lasting performance in demanding marine environments.

Featuring top-mounted hose connections, the tank prevents sewage from standing in the discharge hose — one of the leading causes of odor permeation in marine systems. The raised vacuum relief valve with an easy-clean screw cap safeguards the tank during high-vacuum dock pumpouts and protects against collapse caused by blocked vent lines.

Each Trionic Super Premium Tank comes complete with quality fittings for secure installation. All inlet, outlet, and vent fittings are rotatable, making installation simple and adaptable to your boat’s layout.

Includes the following fittings:

  • 1/2” NPT x 5/8” barb vent assembly

  • Inspection port

  • 1-1/2” inlet

  • 1-1/2” outlet (pumpout)

  • Vacuum relief valve

An optional overboard discharge fitting is available for an additional $30.

Dimensions:

  • Length: 40 in

  • Width: 20 in

  • Height (with fittings): 19 in

Trionic holding tanks meet U.S. Coast Guard requirements, ensuring superior sanitation, safety, and durability for marine waste systems.

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