Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Dometic DVF Holding Tank Vent Filter Replacement Cartridge - 309311004
$154.48 -
9% offPlastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$196.36$176.79 -
Todd Fresh Water/Waste Water Holding Tank
$119.43 - $476.13 -
SCAD TM1 Tank Monitor with External Sensor Strip - 10040
$253.03 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$519.02 -
9% offSCAD TM2 Tank Monitor for Two Tanks - 10041
$205.78$185.26 -
9% offPlastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$212.57$191.38 -
14% offNauta Flexible Fresh Water Tank
$485.27 - $822.79$412.58 - $699.46 -
Maretron NMEA 2000 Tank Level Monitor - TLM100-01
$331.33 -
9% offPlastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$154.50$139.11 -
Vetus Flexible Waste Water Holding Tank
$365.13 - $721.54 -
9% offPlastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$292.23$263.07 -
SCAD Technologies External Tape-On Tank Sensor - 10022
$82.93 -
Dometic 20 HTS-VRT Basic Series Waste Water Holding Tank System - 18 Gal - 322840202
$782.50 -
Vetus Flexible Fresh Water Tank
$261.18 - $492.03 -
Vetus Universal Synthetic Tank
$226.34 - $1,176.78 -
Nauta Flexible Tank Fill Fitting - FTP2221
$86.98 -
Maretron Tank Level NMEA 2000 Adapter - TLA100-01
$371.83 -
Groco Tank Level Sensor - 08-0004-02
$328.63 -
Scepter Potable Water Jerry Can - 5 Gal - 04933
$37.09 -
14% offNauta Heavy Duty Diesel Fuel and Waste Tank - 14.5 Gal - FT915122
$743.12$631.75 -
Dometic 25 HTS-HRZ Basic Series Waste Water Holding Tank System - 25 Gal - 322800251
$705.54 -
Dometic DTM01 Holding Tank Monitor - 313002311
$221.98 -
Dometic Multi-Level Tank Monitor System
$489.28 -
Dometic Universal Holding Tank Cleanout Kit - 307238685
$68.08 -
Blue Sea Systems M2 OLED Digital Tank Monitor - 1839
$373.18 -
Groco SweetTank Odor Neutralization System
$490.65 - $498.75 -
Maretron TFT-5H-Focus Tube Kit - TFT-5H
$81.60 -
Vetus Flexible Tank Fitting
$28.93 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$93.73 -
SCAD Technologies Internal Tank Sensor - 10021
$99.13 -
Raritan Holding Tank Monitor - 1510012
$683.68 -
Raritan Holding Tank Monitor Indicator Panel - 1520012
$366.43 -
Vetus Inspection Lid
$24.90 - $89.68 -
Maretron Tank Level Sender - TLM150-01
$371.83 -
Nauta Flexible Tank Drawing Nipple - FTP311
$30.28 -
Vetus No-Smell Filter with Connections
$115.33 - $162.58 -
Victron Energy GX Tank 140 System Monitoring - BPP920140100
$133.73 -
Dometic Holding Tank Flange Kit - 307230272
$58.63 -
LIST 3-Level Waste Tank Monitor - TM-332111
$323.25 -
Groco 4-Way Tank Selector Kit - TS-350-T
$240.90 -
9% off
Blue Sea Mini OLED Tank Meter
$70.78$63.76 -
Vetus Ultrasonic Fluid Level Sensor
$238.18 - $248.98 -
Raritan Tank Sensor - Float Style - STCFL
$145.03 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$43.78 -
Raritan Tank Sensor Module Kit - 15101
$167.98 -
Nauta Flexible Tank Vent Fitting - FTPE300
$20.17 -
Todd Holding Tank Fitting Adapter Kit - 93-2223
$34.33
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!