Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Dometic DVF Holding Tank Vent Filter Replacement Cartridge - 309311004
$154.48 -
Plastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$196.36 -
Plastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$292.23 -
Plastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$212.57 -
Todd Fresh Water/Waste Water Holding Tank
$119.43 - $476.13 -
Plastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$154.50 -
Maretron NMEA 2000 Tank Level Monitor - TLM100-01
$304.33 -
14% offNauta Flexible Fresh Water Tank
$485.27 - $822.79$412.58 - $699.46 -
Vetus Flexible Fresh Water Tank
$261.18 - $492.03 -
14% offNauta Heavy Duty Diesel Fuel and Waste Tank - 14.5 Gal - FT915122
$743.12$631.75 -
Dometic 20 HTS-VRT Basic Series Waste Water Holding Tank System - 18 Gal - 322840202
$782.50 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$519.02 -
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
$574.44 -
Dometic Multi-Level Tank Monitor System
$489.28 -
Blue Sea Systems M2 OLED Digital Tank Monitor - 1839
$373.18 -
Nauta Flexible Tank Fill Fitting - FTP2221
$81.58 -
Vetus Flexible Waste Water Holding Tank
$365.13 - $721.54 -
Dometic DTM01 Holding Tank Monitor - 313002311
$221.98 -
Raritan Holding Tank Monitor - 1510012
$683.68 -
Vetus Inspection Lid
$24.90 - $89.68 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$93.73 -
Maretron TFT-5H-Focus Tube Kit - TFT-5H
$78.90 -
Maretron Tank Level NMEA 2000 Adapter - TLA100-01
$377.23 -
Vetus Universal Synthetic Tank
$226.34 - $1,176.78 -
LIST 3-Level Waste Tank Monitor - TM-332111
$320.55 -
Dometic Universal Holding Tank Cleanout Kit - 307238685
$68.08 -
Scepter Potable Water Jerry Can - 5 Gal - 04933
$37.09 -
Vetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$31.63 -
Vetus No-Smell Filter with Connections
$115.33 - $162.58 -
SCAD Technologies Internal Tank Sensor - 10021
$99.13 -
Raritan Tank Sensor Module Kit - 15101
$167.98 -
Vetus Flexible Tank Fitting
$28.93 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$43.78 -
Maretron Tank Level Sender - TLM150-01
$373.18 -
Groco 4-Way Tank Selector Kit - TS-350-T
$240.90 -
Vetus Ultrasonic Fluid Level Sensor
$238.18 - $248.98 -
Veratron Fresh Water Level Sensor with Sealing Kit #370
$240.68 - $590.61 -
Nauta Flexible Tank Drawing Nipple - FTP311
$28.93 -
Victron Energy GX Tank 140 System Monitoring - BPP920140100
$133.73 -
Veratron Level Sensor Single Station with Seal Kit - 226-801-015-001G
$101.20 -
Blue Sea Mini OLED Tank Meter
$70.78 -
Todd Holding Tank Fitting Adapter Kit - 93-2223
$34.33 -
Vetus Fuel Connection Kit Filler
$278.70 - $305.72 -
Todd Holding Tank Fitting Adapter Kit - 93-2220
$34.33 -
Todd Water Tank Relocation Kit - 90-2219
$101.83 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$93.75 -
Groco SweetTank Odor Neutralization System
$490.65 - $498.75
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!