Welcome to Defender Canada! 
Water / Waste Holding Tanks
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14% offVetus Flexible Fresh Water Tank
$282.41 - $532.07$240.15 - $452.36 -
14% offVetus Flexible Waste Water Holding Tank
$394.83 - $780.27$335.70 - $663.33 -
Maretron Tank Level Sender - TLM150-01
$347.33 -
Veratron VDO Fresh Water Level Sender - 226-828-001-001K
$562.98 -
9% offTodd Fresh Water/Waste Water Holding Tank
$136.41 - $428.61$122.84 - $385.83 -
14% offPlastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$161.21$137.12 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$96.29 -
9% offSCAD TM2 Tank Monitor for Two Tanks - 10041
$222.50$200.31 -
9% offScepter Potable Water Jerry Can - 5 Gal - 04933
$40.05$36.11 -
9% offDometic Universal Holding Tank Cleanout Kit - 307238685
$67.74$61.03 -
9% offVetus Inspection Lid
$26.88 - $96.94$24.25 - $87.31 -
9% offDometic DVF Holding Tank Vent Filter Replacement Cartridge - 309311004
$165.56$149.07 -
9% offSCAD TM1 Tank Monitor with External Sensor Strip - 10040
$273.60$246.30 -
19% offLIST 3-Level Waste Tank Monitor - TM-332111
$346.62$277.42 -
9% offDometic DTM04 TankWatch 4-Level Tank Monitor System
$524.76$472.35 -
Nauta Flexible Tank Fill Fitting - FTP1210
$24.29 -
9% offTodd Water Tank Relocation Kit - 90-2218
$82.34$74.17 -
9% offVetus Flexible Tank Fitting
$31.24$28.18 -
14% offNauta Flexible Fresh Water Tank
$524.76 - $889.77$446.14 - $756.40 -
19% offLIST 3-Level Water Tank Monitor - TM-331111
$346.62$277.42 -
19% offLIST Single-Level Waste Tank Alarm - 3/4 Alert - TM-132111
$223.98$179.30 -
34% offLIST Single-Level Water Tank Alarm - 1/4 Alert - TM-131111
$209.38$136.30 -
Maretron NMEA 2000 Tank Level Monitor - TLM100-01
$302.95 -
Maretron NMEA 2000 Tank Temperature Immersion Probe - TP-IP-1
$168.41 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$100.47 -
Maretron Tank Level NMEA 2000 Adapter - TLA100-01
$354.27 -
Maretron TFT-5H-Focus Tube Kit - TFT-5H
$72.73 -
9% offDometic Multi-Level Tank Monitor System
$495.52$446.03 -
14% offVetus Waste Tank Repair Set - REPSETOT
$28.97$24.72 -
Veratron Fresh Water Level Sensor with Sealing Kit #370
$235.79 - $578.76 -
Veratron Fresh Water Level Sensor with Sealing Kit #930
$235.79 - $574.38 -
Veratron Waste Water Level Sensor with Sealing Kit #930
$376.39 - $719.36 -
Victron Energy VE.Can Resistive Tank Sender Adapter - BPP900600100
$484.61 -
Victron Energy GX Tank 140 System Monitoring - BPP920140100
$144.57 -
Veratron Level Sensor Single Station with Seal Kit - 226-801-015-001G
$99.13 -
Veratron Marine NMEA 2000 Liquid Level Sensor - B00041501
$789.00 -
Veratron OceanLink Fresh Water Gauge - 52 mm (2 1/16")
$93.89 -
Todd Holding Tank Fitting Adapter Kit - 93-2223
$37.08 -
9% offTodd Holding Tank Fitting Adapter Kit - 93-2220
$37.08$33.43 -
9% offTodd Holding Tank Fitting Adapter Kit - 93-2221
$47.30$42.63 -
9% offTodd Holding Tank Fitting Adapter Kit - 93-2222
$31.24$28.18 -
9% offTodd Water Tank Relocation Kit - 90-2219
$110.08$99.13 -
14% offPlastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$245.91$209.12 -
14% offPlastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$117.40$99.88 -
14% offPlastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$186.04$158.23 -
9% off
Blue Sea Mini OLED Tank Meter
$69.20 - $70.66$62.34 - $63.66 -
9% offBlue Sea Systems M2 OLED Digital Tank Monitor - 1839
$403.54$363.25 -
9% offRaritan Tank Sensor - Float Style - STCFL
$156.80$141.18
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!