Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Vetus Flexible Fresh Water Tank
$261.18 - $492.03 -
Vetus Flexible Waste Water Holding Tank
$365.13 - $721.54 -
Vetus Flexible Tank Fitting
$28.93 -
Plastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$196.36 -
Veratron VDO Fresh Water Level Sender - 226-828-001-001K
$725.35 -
Victron Energy GX Tank 140 System Monitoring - BPP920140100
$133.73 -
Plastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$154.50 -
Maretron NMEA 2000 Tank Level Monitor - TLM100-01
$331.33 -
Maretron Tank Level Sender - TLM150-01
$371.83 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$93.73 -
SCAD Technologies External Tape-On Tank Sensor - 10022
$82.93 -
9% offSCAD TM2 Tank Monitor for Two Tanks - 10041
$205.78$185.26 -
Scepter Potable Water Jerry Can - 5 Gal - 04933
$37.09 -
Dometic DTM01 Holding Tank Monitor - 313002311
$221.98 -
Dometic DVF Holding Tank Vent Filter Replacement Cartridge - 309311004
$154.48 -
Dometic Universal Holding Tank Cleanout Kit - 307238685
$68.08 -
Vetus Inspection Lid
$24.90 - $89.68 -
Perko Inlet Check Valve - 0635DP0
$22.10 -
Todd Fresh Water/Waste Water Holding Tank
$119.43 - $476.13 -
14% offNauta Flexible Fresh Water Tank
$485.27 - $822.79$412.58 - $699.46 -
LIST 3-Level Waste Tank Monitor - TM-332111
$323.25 -
SCAD TM1 Tank Monitor with External Sensor Strip - 10040
$253.03 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$519.02 -
Nauta Flexible Tank Fill Fitting - FTP1210
$23.85 -
Vetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$31.63 -
Todd Water Tank Relocation Kit - 90-2218
$76.18 -
Vetus No-Smell Filter with Connections
$115.33 - $162.58 -
Nauta Flexible Tank Drawing Nipple - FTP1300
$17.05 -
Nauta Flexible Tank Drawing Nipple - FTP311
$30.28 -
Nauta Flexible Tank Drawing Nipple - FTP300
$17.24 -
Nauta Flexible Tank Drawing Nipple - FTP400
$21.46 -
Nauta Flexible Tank Fill Fitting - FTP2221
$86.98 -
Nauta Flexible Tank Vent Fitting - FTPE300
$20.17 -
14% offNauta Heavy Duty Diesel Fuel and Waste Tank - 14.5 Gal - FT915122
$743.12$631.75 -
Dometic Multi-Level Tank Monitor System
$489.28 -
Vetus Waste Tank Repair Set - REPSETOT
$26.83 -
Veratron Level Sensor Single Station with Seal Kit - 226-801-015-001G
$127.57 -
Veratron Marine NMEA 2000 Liquid Level Sensor - B00041501
$1,123.80 -
Veratron OceanLink Fresh Water Gauge - 52 mm (2 1/16")
$122.10 -
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 -
Veratron Waste Water Level Sensor with Sealing Kit #930
$484.90 - $926.81 -
Victron Energy VE.Can Resistive Tank Sender Adapter - BPP900600100
$448.14 -
Plastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$292.23 -
Plastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$212.57 -
64% offOceanic Systems 4-20mA Tank Level Adaptor - 4291
$365.08$128.17 -
56% offOceanic Systems Deck-Mounted Water Gauge - 5250-W
$439.33$189.60 -
56% offOceanic Systems Submersible Hydrostatic Sensor
$439.33$189.60
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!