Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Raritan TankAssure Control Panel with Sensor - 15600
$893.14 -
Dometic 25 HTS-HRZ Basic Series Waste Water Holding Tank System - 25 Gal - 322800251
$780.57 -
Veratron VDO Fresh Water Level Sender - 226-828-001-001K
$757.56 -
14% offNauta Heavy Duty Diesel Fuel and Waste Tank - 14.5 Gal - FT915122
$776.12$659.80 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$574.49 - $591.53 -
Raritan TankAssure Sensor Kit - 15610
$551.91 -
Dometic Multi-Level Tank Monitor System
$542.02 -
Groco SweetTank Odor Neutralization System
$513.84 - $525.12 -
Veratron Waste Water Level Sensor with Sealing Kit #930
$506.42 - $967.98 -
Raritan TankAssure NMEA2000 Adapter - 15630
$498.31 -
14% offNauta Flexible Fresh Water Tank
$506.81 - $859.32$430.89 - $730.52 -
Maretron Tank Level NMEA 2000 Adapter - TLA100-01
$417.94 -
Maretron Tank Level Sender - TLM150-01
$415.12 -
Blue Sea Systems M2 OLED Digital Tank Monitor - 1839
$389.74 -
Vetus Flexible Waste Water Holding Tank
$387.01 - $1,259.76 -
Raritan Holding Tank Monitor Indicator Panel - 1520012
$382.69 -
Maretron NMEA 2000 Tank Level Monitor - TLM100-01
$371.41 -
Groco Tank Level Sensor - 08-0004-02
$346.03 -
LIST 3-Level Water Tank Monitor - TM-331111
$337.59 -
LIST 3-Level Waste Tank Monitor - TM-332111
$337.59 -
Vetus Fuel Connection Kit Filler
$319.28 - $443.35 -
Veratron Fresh Water Level Sensor with Sealing Kit #370
$317.21 - $778.76 -
Plastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$308.02 -
SCAD TM1 Tank Monitor with External Sensor Strip - 10040
$289.63 -
Vetus Ultrasonic Fluid Level Sensor
$281.17 - $295.27 -
Vetus Flexible Fresh Water Tank
$275.58 - $582.96 -
Vetus Universal Synthetic Tank
$266.40 - $1,364.20 -
Groco 4-Way Tank Selector Kit - TS-350-T
$264.27 -
Vetus Universal Tank Float Sensor
$248.74 - $365.77 -
Dometic DTM01 Holding Tank Monitor - 313002311
$244.51 -
Plastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$224.83 -
LIST Single-Level Waste Tank Alarm - 3/4 Alert - TM-132111
$219.15 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$213.49 -
Plastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$210.73 -
Maretron NMEA 2000 Tank Temperature Immersion Probe - TP-IP-1
$205.03 -
Thetford Tecma Field-Effect Tank Sensor
$189.47 -
Plastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$185.35 -
Raritan Tank Sensor Module Kit - 15101
$175.42 -
Dometic DVF Holding Tank Vent Filter Replacement Cartridge - 309311004
$174.06 -
Raritan Tank Sensor - Float Style - STCFL
$155.68 -
66% offOceanic Systems Deck-Mounted Water Gauge - 5250-W
$458.83$152.17 -
Vetus No-Smell Filter with Connections
$150.04 - $190.93 -
SCAD Technologies Internal Tank Sensor - 10021
$147.22 -
Victron Energy GX Tank 140 System Monitoring - BPP920140100
$139.64 -
Veratron Level Sensor Single Station with Seal Kit - 226-801-015-001G
$133.21 -
Todd Fresh Water/Waste Water Holding Tank
$124.71 - $497.25 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$120.45 -
44% offLIST Single-Level Water Tank Alarm - 1/4 Alert - TM-131111
$202.23$111.49
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!