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Marine Water Tanks, Treatments & Sensors

Fisheries Supply is your premier supplier of marine fresh-water tanks and boat water tank sensors from the top brands. We offer a full range of boat water tanks, marine fresh-water tank gauges, tank treatments and more. A boat water tank gauge is great for making sure you always know exactly how much water is left in your boat fresh-water tank – so shop now and save or browse our other tank products like marine holding tanks.


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Tank Tender

The Tank Tender - 5 Tank Model

Available in 3 options

Special Order Only
Tank Sensors

SCAD Technologies

SCAD Tank Sensors

Available in 3 options

In Stock
|
Ships immediately
14 Gallon Short Rectangular Water or Holding Tank

Trionic Corp

14 Gallon Short Rectangular Water or Holding Tank

SKU: 440980 | Item ID: TRC WH-2014

Special Order Only
14 Gallon Long Rectangular Blank Water or Holding Tank

Trionic Corp

14 Gallon Long Rectangular Blank Water or Holding Tank

SKU: 214516 | Item ID: TRC B-2014

Special Order Only
20 Gallon Long Rectangular Water or Holding Tank

Trionic Corp

20 Gallon Long Rectangular Water or Holding Tank

SKU: 454035 | Item ID: TRC WH-2020

Special Order Only
6-8-10 of SeaBuilt Tank Access Plate System - Stainless Steel

SeaBuilt

Tank Access Plate System - Stainless Steel

Available in 5 options

In Stock
|
Ships immediately

Trionic Corp

37 Gallon Long Rectangular Blank Water or Holding Tank

SKU: 449459 | Item ID: TRC B-2037

Special Order Only

SeaBuilt

Tank Access Plate System - Aluminum

Available in 5 options

In Stock
|
Ships immediately

Trionic Corp

40 Gallon Short Rectangular Water or Holding Tank

SKU: 377247 | Item ID: TRC 2040-2

Special Order Only

Nauta

Flexible Water Tanks

Available in 3 options

Special Order Only

Nauta

Flexible Tank Fittings

Available in 11 options

Special Order Only

Trionic Corp

45 Gallon Long Rectangular Water or Holding Tank

SKU: 386069 | Item ID: TRC 2045-1

Special Order Only

Sudbury

Aqua Clear Drinking Water Rust Treatment

SKU: 30396 | Item ID: SUD 835Q

In Stock
|
Ships immediately

Tank Tender

The Tank Tender - Models for Up to 10 Tanks

Available in 3 options

Special Order Only

Sudbury

Aqua Fresh Drinking Water Taste & Odor Treatment

SKU: 30397 | Item ID: SUD 830

Out of Stock

Tank Tender

The Tank Tender - Models for Up to 4 Tanks

Available in 6 options

In Stock
|
Ships immediately

Tank Tender

Tank Tender - Selector Valve Kit for Additional Tank

SKU: 31775 | Item ID: T/T VAK

In Stock
|
Ships immediately

Tank Tender

Tank Tender - Tank Level Calibration Card

SKU: 53469 | Item ID: T/T CC

In Stock
|
Ships immediately

Tank Tender

Tank Tender - Replacement Panel Gauges

Available in 2 options

In Stock
|
Ships immediately

Tank Tender

Tank Tender - Tank Penetration Fittings

SKU: 31776 | Item ID: T/T TPF

In Stock
|
Ships immediately

Tank Tender

Tank Tender - Extender Tube for Tank Penetration Fitting

SKU: 31778 | Item ID: T/T EXT

In Stock
|
Ships immediately

Tank Tender

Tank Tender - Panel to Tank Tubing

SKU: 31777 | Item ID: T/T NT

Out of Stock

Tank Tender

Tank Tender - Replacement Panel Gauge Lens

SKU: 68123 | Item ID: T/T GL

Special Order Only

Tank Tender

Tank Tender - Tubing Splicer

SKU: 40011 | Item ID: T/T UN

In Stock
|
Ships immediately

Tank Tender

Tank Tender - Replacement Pump Assembly

SKU: 59015 | Item ID: T/T PA

In Stock
|
Ships immediately

Thetford

Thetford Fresh Water Tank Sanitizer

SKU: 179173 | Item ID: THE 36662

In Stock
|
Ships immediately

Whale

Gray Water Waste Tank - 2.2 Gal with Level Sensor

SKU: 211114 | Item ID: WHA GT0810B

In Stock
|
Ships immediately

Headhunter

WTS-1500 Tank Sentry System

SKU: 363335 | Item ID: HDH WTS1500

Special Order Only

Headhunter

TS-2500B Tank Sentry System - with Low Level Alarm

SKU: 190337 | Item ID: HDH TS2500B-SST

Special Order Only

Headhunter

MO-3000 Series Tank Sentry Repeaters - Panel Only

Available in 2 options

Special Order Only

Headhunter

TS-2000B Tank Sentry - with High and Low Level Alarms

Available in 3 options

Special Order Only

Headhunter

TS-3000 Series Tank Sentry Repeaters - Panel Complete

Available in 2 options

Special Order Only

Headhunter

Puffer Pressure Accumulator Tank

Available in 3 options

In Stock
|
Ships immediately

Todd

3 Gallon Water Or Holding Tank

SKU: 203243 | Item ID: TOD 85-1859WH

In Stock
|
Ships immediately

Todd

6 Gallon Water Or Holding Tank

SKU: 203237 | Item ID: TOD 85-1531WH

Out of Stock

Vetus

Vetus Drinking Water Tanks

Available in 5 options

Special Order Only

Todd

9 Gallon Water Or Holding Tank

SKU: 203242 | Item ID: TOD 85-1667WH

In Stock
|
Ships immediately

Vetus

Rigid Drinking Water / Waste Tank Installation Kit

SKU: 180741 | Item ID: DEN WTKIT

Special Order Only

Todd

13 Gallon Water Or Holding Tank

SKU: 203240 | Item ID: TOD 85-1626WH

Out of Stock

Todd

15 Gallon Water Or Holding Tank

SKU: 203244 | Item ID: TOD 94-1627WH

In Stock
|
Ships immediately

Todd

20 Gallon Water Or Holding Tank

SKU: 203241 | Item ID: TOD 85-1666WH

In Stock
|
Ships immediately

Todd

25 Gallon Water Or Holding Tank

SKU: 203238 | Item ID: TOD 85-1532WH

In Stock
|
Ships immediately

Todd

35 Gallon Water Or Holding Tank

SKU: 203236 | Item ID: TOD 85-1525WH

In Stock
|
Ships immediately

Todd

55 Gallon Water Or Holding Tank

SKU: 203239 | Item ID: TOD 85-1533WH

In Stock
|
Ships immediately

Todd

Water Tank Adapter Kits

Available in 4 options

In Stock
|
Ships immediately
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