Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Maretron NMEA 2000 Tank Temperature Immersion Probe - TP-IP-1
$196.33 -
Plastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$196.36 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$205.78 -
LIST Single-Level Waste Tank Alarm - 3/4 Alert - TM-132111
$209.85 -
Vetus Universal Tank Float Sensor
$211.18 - $311.08 -
Plastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$212.57 -
Vetus Universal Synthetic Tank
$219.15 - $1,176.78 -
Dometic DTM01 Holding Tank Monitor - 313002311
$221.98 -
Vetus Ultrasonic Fluid Level Sensor
$238.18 - $248.98 -
Groco 4-Way Tank Selector Kit - TS-350-T
$240.90 -
SCAD TM1 Tank Monitor with External Sensor Strip - 10040
$253.03 -
Vetus Flexible Fresh Water Tank
$261.18 - $492.03 -
Vetus Fuel Connection Kit Filler
$278.70 - $305.72 -
Plastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$292.23 -
Veratron Fresh Water Level Sensor with Sealing Kit #370
$303.74 - $745.65 -
Veratron Fresh Water Level Sensor with Sealing Kit #930
$303.74 - $733.65 -
LIST 3-Level Waste Tank Monitor - TM-332111
$323.25 -
LIST 3-Level Water Tank Monitor - TM-331111
$323.25 -
Maretron NMEA 2000 Tank Level Monitor - TLM100-01
$331.33 -
Groco Tank Level Sensor - 08-0004-02
$335.38 -
Vetus Flexible Waste Water Holding Tank
$354.33 - $721.54 -
Raritan Holding Tank Monitor Indicator Panel - 1520012
$366.43 -
Maretron Tank Level NMEA 2000 Adapter - TLA100-01
$371.83 -
Maretron Tank Level Sender - TLM150-01
$371.83 -
Blue Sea Systems M2 OLED Digital Tank Monitor - 1839
$373.18 -
14% offNauta Flexible Fresh Water Tank
$485.27 - $822.79$412.58 - $699.46 -
Groco Tank Level Sensor Assembly - 450 ASSY
$437.98 -
Victron Energy VE.Can Resistive Tank Sender Adapter - BPP900600100
$448.14 -
Raritan TankAssure Sensor Kit - 15610
$482.55 -
Veratron Waste Water Level Sensor with Sealing Kit #930
$484.90 - $926.81 -
Dometic Multi-Level Tank Monitor System
$489.28 -
Groco SweetTank Odor Neutralization System
$492.00 - $506.85 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$519.02 -
Raritan TankAssure NMEA2000 Adapter - 15630
$528.43 -
14% offNauta Heavy Duty Diesel Fuel and Waste Tank - 14.5 Gal - FT915122
$743.12$631.75 -
Raritan Holding Tank Monitor - 1510012
$683.68 -
Dometic 12 HTS-VRT Basic Series Waste Water Holding Tank System - 11 Gal - 322840122
$695.96 -
Dometic 12 HTS-HRZ Basic Series Waste Water Holding Tank System - 11 Gal - 322840121
$698.68 -
Dometic 25 HTS-HRZ Basic Series Waste Water Holding Tank System - 25 Gal - 322800251
$705.54 -
Veratron VDO Fresh Water Level Sender - 226-828-001-001K
$725.35 -
Dometic 20 HTS-HRZ Basic Series Waste Water Holding Tank System - 18 Gal - 322840201
$768.89 -
Dometic 20 HTS-VRT Basic Series Waste Water Holding Tank System - 18 Gal - 322840202
$782.50 -
Raritan TankAssure Control Panel with Sensor - 15600
$795.76 -
Dometic 30 HTS-HRZ Basic Series Waste Water Holding Tank System - 28 Gal - 322840301
$810.85 -
Dometic 15 HTS-HRZ Basic Series Waste Water Holding Tank System - 15 Gal - 322840151
$885.07 -
Dometic 15 HTS-VRT Basic Series Waste Water Holding Tank System - 15 Gal - 322840152
$886.42 -
Dometic 40 HTS-HRZ Basic Series Waste Water Holding Tank System - 34 Gal - 322840401
$906.70 -
Dometic 55 HTS-HRZ Basic Series Waste Water Holding Tank System - 55 Gal - 322840551
$968.89
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!