Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$105.72 -
Maretron Tank Level NMEA 2000 Adapter - TLA100-01
$372.88 -
Todd Water Tank Relocation Kit - 90-2219
$110.08 -
Victron Energy GX Tank 140 System Monitoring - BPP920140100
$144.57 -
Nauta Flexible Tank Vent Fitting - FTPE300
$20.53 -
Groco SweetTank Odor Neutralization System
$530.58 - $539.34 -
Dometic 15 HTS-VRT Basic Series Waste Water Holding Tank System - 15 Gal - 322840152
$904.56 -
Vetus Right Angle Hose Connection
$38.54 -
Todd Holding Tank Fitting Adapter Kit - 93-2223
$37.08 -
Todd Water Tank Relocation Kit - 90-2218
$82.34 -
SCAD Technologies Adapter Plate - 10029
$60.44 -
49% offOceanic Systems Submersible Hydrostatic Sensor
$475.08$238.24 -
Raritan Tank Sensor Module Kit - 15101
$181.62 -
Nauta Flexible Tank Drawing Nipple - FTP1300
$18.40 -
Nauta Flexible Tank Drawing Nipple - FTP300
$17.56 -
Nauta Flexible Tank Drawing Nipple - FTP400
$21.86 -
Maretron NMEA 2000 Tank Temperature Immersion Probe - TP-IP-1
$177.24 -
Perko Inlet Check Valve - 0635DP0
$25.81 -
Vetus Ultrasonic Fluid Level Sensor
$257.54 - $269.22 -
Vetus Connection Kit
$101.32 - $121.79 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$524.76 -
50% offOceanic Systems 4-20mA Tank Level Adaptor - 4291
$394.78$197.36 -
Vetus Waste Tank Repair Set - REPSETOT
$28.97 -
Veratron Fresh Water Level Sensor with Sealing Kit #930
$235.79 - $574.38 -
Todd Holding Tank Fitting Adapter Kit - 93-2222
$31.24 -
Raritan Tank Monitor Indicator Panel Wire Harness - 152WH
$51.68 -
34% offLIST Single-Level Water Tank Alarm - 1/4 Alert - TM-131111
$209.38$136.30 -
Dometic 10 HTS-T Waste Water Holding Tank System with Pump - 10 Gal - 322721012
$1,596.65 -
Dometic 28 HTS-T Waste Water Holding Tank System with Pump - 28 Gal - 322012812
$2,021.48 -
Dometic Holding Tank Diptube Kit - 385310660
$83.84 -
Dometic Holding Tank Flange Kit - 307230272
$58.98 -
Vetus Fuel Tank Float Sensor - FSENSOR
$76.50 -
Vetus Fuel Connection Kit Filler
$317.42 - $348.10 -
49% offOceanic Systems Deck-Mounted Water Gauge - 5250-W
$475.08$238.24 -
49% offOceanic Systems Panel-Mounted Holding Tank Pumpout Gauge - 3350-HTPO
$402.08$201.74 -
Veratron Marine NMEA 2000 Liquid Level Sensor - B00041501
$789.00 -
Veratron OceanLink Fresh Water Gauge - 52 mm (2 1/16")
$93.89 -
Veratron Fresh Water Level Sensor with Sealing Kit #370
$235.79 - $578.76 -
Veratron Waste Water Level Sensor with Sealing Kit #930
$376.39 - $719.36 -
Victron Energy VE.Can Resistive Tank Sender Adapter - BPP900600100
$484.61 -
Faria Euro Black Potable Water Tank Level Gauge - 12831
$45.86 -
Groco Full Color Touchscreen LCD Monitor - 5" - LCD-5
$2,186.22 -
Raritan TankAssure Sensor Kit - 15610
$521.82 -
Raritan TankAssure NMEA2000 Adapter - 15630
$571.44 -
Groco Tank Level Sensor Assembly - 450 ASSY
$464.86 -
Dometic 12 HTS-VRT Basic Series Waste Water Holding Tank System - 11 Gal - 322840122
$710.27 -
Dometic 15 HTS-HRZ Basic Series Waste Water Holding Tank System - 15 Gal - 322840151
$904.56 -
Dometic 20 HTS-HRZ Basic Series Waste Water Holding Tank System - 18 Gal - 322840201
$784.75
About Water / Waste Holding Tanks
Water and Waste Holding Tanks & Fittings
Water / Waste Holding Tanks & Fittings - Defender offers parts galore and a selection of marine holding tanks for waste holding, black water tanks and marine water tanks that will fit just about any boat and application.
What size marine holding tank do you need?
Consider first the boat's needs. Defender offers a full line of marine holding tanks that will fit below any and all decks. The shape and size of your new marine holding tank, the location of the intake and the construction of the tank itself will more accurately determine how many gallons you need.
Boat holding tank construction ABC's.
Rigid tanks are built from polyethylene plastic that is super strong and holds odors inside. Sealed pipe fittings and plugs offer easy conversion from waste storage to water storage on most tanks at Defender. If flexible tanks are a necessity due to boat storage limitations look for 3-layer construction with welded seams.
How long do marine waste holding tanks last?
High quality marine holding tanks from Defender should last as long as your love affair with your boat! High strength plastic with pre drilled fittings and sealed plugs ensure that the chance for leaks are minimal and a holding tank placed under the deck will stay put for quite some time!