Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Dometic 15 HTS-VRT Basic Series Waste Water Holding Tank System - 15 Gal - 322840152
$904.56 -
Raritan TankAssure Control Panel with Sensor - 15600
$860.55 -
Nauta Heavy Duty Diesel Fuel and Waste Tank - 14.5 Gal - FT915122
$803.62 -
Dometic 20 HTS-VRT Basic Series Waste Water Holding Tank System - 18 Gal - 322840202
$799.47 -
Raritan Holding Tank Monitor - 1510012
$739.34 -
Dometic 25 HTS-HRZ Basic Series Waste Water Holding Tank System - 25 Gal - 322800251
$722.08 -
Raritan TankAssure NMEA2000 Adapter - 15630
$571.44 -
Veratron VDO Fresh Water Level Sender - 226-828-001-001K
$562.98 -
Groco SweetTank Odor Neutralization System
$530.58 - $539.34 -
Nauta Flexible Fresh Water Tank
$524.76 - $889.77 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$524.76 -
Raritan TankAssure Sensor Kit - 15610
$521.82 -
Dometic Multi-Level Tank Monitor System
$495.52 -
Victron Energy VE.Can Resistive Tank Sender Adapter - BPP900600100
$484.61 -
Blue Sea Systems M2 OLED Digital Tank Monitor - 1839
$403.54 -
Raritan Holding Tank Monitor Indicator Panel - 1520012
$396.24 -
Vetus Flexible Waste Water Holding Tank
$394.83 - $780.27 -
Maretron Tank Level NMEA 2000 Adapter - TLA100-01
$384.56 -
Maretron Tank Level Sender - TLM150-01
$380.18 -
Veratron Waste Water Level Sensor with Sealing Kit #930
$376.39 - $719.36 -
Groco Tank Level Sensor - 08-0004-02
$355.36 -
LIST 3-Level Water Tank Monitor - TM-331111
$349.54 -
Maretron NMEA 2000 Tank Level Monitor - TLM100-01
$329.08 -
Vetus Fuel Connection Kit Filler
$301.36 - $330.58 -
Vetus Flexible Fresh Water Tank
$282.41 - $532.07 -
19% offLIST 3-Level Waste Tank Monitor - TM-332111
$346.62$277.42 -
SCAD TM1 Tank Monitor with External Sensor Strip - 10040
$273.60 -
Groco 4-Way Tank Selector Kit - TS-350-T
$260.48 -
Vetus Ultrasonic Fluid Level Sensor
$257.54 - $269.22 -
Plastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$247.37 -
Vetus Universal Synthetic Tank
$244.73 - $1,272.61 -
Veratron Fresh Water Level Sensor with Sealing Kit #370
$235.79 - $578.76 -
Dometic DTM01 Holding Tank Monitor - 313002311
$229.80 -
Vetus Universal Tank Float Sensor
$228.34 - $336.38 -
LIST Single-Level Waste Tank Alarm - 3/4 Alert - TM-132111
$226.90 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$222.50 -
56% offOceanic Systems Deck-Mounted Water Gauge - 5250-W
$475.08$205.00 -
56% offOceanic Systems Submersible Hydrostatic Sensor
$475.08$205.00 -
Maretron NMEA 2000 Tank Temperature Immersion Probe - TP-IP-1
$204.98 -
Plastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$187.50 -
54% offOceanic Systems Panel-Mounted Holding Tank Pumpout Gauge - 3350-HTPO
$402.08$183.10 -
53% offOceanic Systems 4-20mA Tank Level Adaptor - 4291
$394.78$183.10 -
Raritan Tank Sensor Module Kit - 15101
$181.62 -
Plastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$162.67 -
Raritan Tank Sensor - Float Style - STCFL
$156.80 -
Dometic DVF Holding Tank Vent Filter Replacement Cartridge - 309311004
$156.80 -
Victron Energy GX Tank 140 System Monitoring - BPP920140100
$144.57 -
Todd Fresh Water/Waste Water Holding Tank
$136.41 - $428.61
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!