Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Dometic DVF Holding Tank Vent Filter Replacement Cartridge - 309311004
$154.48 -
Todd Fresh Water/Waste Water Holding Tank
$119.43 - $476.13 -
SCAD TM1 Tank Monitor with External Sensor Strip - 10040
$253.03 -
Plastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$196.36 -
Plastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$212.57 -
Plastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$292.23 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$205.78 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$519.02 -
Plastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$154.50 -
Maretron NMEA 2000 Tank Level Monitor - TLM100-01
$304.33 -
Vetus Flexible Fresh Water Tank
$261.18 - $492.03 -
SCAD Technologies External Tape-On Tank Sensor - 10022
$82.93 -
14% offNauta Flexible Fresh Water Tank
$485.27 - $822.79$412.58 - $699.46 -
Groco Tank Level Sensor - 08-0004-02
$328.63 -
Vetus Flexible Waste Water Holding Tank
$365.13 - $721.54 -
Dometic 20 HTS-VRT Basic Series Waste Water Holding Tank System - 18 Gal - 322840202
$782.50 -
14% offNauta Heavy Duty Diesel Fuel and Waste Tank - 14.5 Gal - FT915122
$743.12$631.75 -
Veratron VDO Fresh Water Level Sender - 226-828-001-001K
$574.44 -
Dometic Multi-Level Tank Monitor System
$489.28 -
Nauta Flexible Tank Fill Fitting - FTP2221
$81.58 -
Dometic DTM01 Holding Tank Monitor - 313002311
$221.98 -
SCAD Technologies Internal Tank Sensor - 10021
$99.13 -
Dometic 25 HTS-HRZ Basic Series Waste Water Holding Tank System - 25 Gal - 322800251
$705.54 -
Scepter Potable Water Jerry Can - 5 Gal - 04933
$37.09 -
Dometic Universal Holding Tank Cleanout Kit - 307238685
$68.08 -
Maretron Tank Level NMEA 2000 Adapter - TLA100-01
$398.83 -
Vetus No-Smell Filter with Connections
$115.33 - $162.58 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$43.78 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$93.73 -
Nauta Flexible Tank Drawing Nipple - FTP311
$28.93 -
Raritan Holding Tank Monitor - 1510012
$683.68 -
Maretron Tank Level Sender - TLM150-01
$351.58 -
9% offVetus Flexible Tank Fitting
$28.93$26.10 - $28.93 -
Vetus Universal Synthetic Tank
$226.34 - $1,176.78 -
Vetus Universal Tank Float Sensor
$211.18 - $311.08 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$103.20 -
Vetus Inspection Lid
$24.90 - $89.68 -
Maretron TFT-5H-Focus Tube Kit - TFT-5H
$73.50 -
Blue Sea Systems M2 OLED Digital Tank Monitor - 1839
$373.18 -
Dometic Holding Tank Flange Kit - 307230272
$58.63 -
Vetus Fuel Connection Kit Filler
$278.70 - $305.72 -
Vetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$31.63 -
Todd Water Tank Relocation Kit - 90-2219
$101.83 -
LIST 3-Level Waste Tank Monitor - TM-332111
$320.55 -
Groco SweetTank Odor Neutralization System
$490.65 - $498.75 -
Groco 4-Way Tank Selector Kit - TS-350-T
$240.90 -
Todd Holding Tank Fitting Adapter Kit - 93-2220
$34.33 -
Vetus Right Angle Hose Connection
$32.98
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!