Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Dometic DVF Holding Tank Vent Filter Replacement Cartridge - 309311004
$161.32 -
SCAD TM1 Tank Monitor with External Sensor Strip - 10040
$260.02 -
Todd Fresh Water/Waste Water Holding Tank
$124.71 - $497.25 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$542.06 -
Plastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$205.06 -
Vetus Flexible Fresh Water Tank
$272.76 - $513.87 -
Vetus Flexible Waste Water Holding Tank
$381.33 - $753.57 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$207.85 -
Plastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$221.99 -
Maretron NMEA 2000 Tank Level Monitor - TLM100-01
$346.03 -
14% offNauta Flexible Fresh Water Tank
$506.81 - $859.32$430.89 - $730.52 -
Dometic 25 HTS-HRZ Basic Series Waste Water Holding Tank System - 25 Gal - 322800251
$736.86 -
14% offNauta Heavy Duty Diesel Fuel and Waste Tank - 14.5 Gal - FT915122
$776.12$659.80 -
Scepter Potable Water Jerry Can - 5 Gal - 04933
$38.70 -
Dometic DTM01 Holding Tank Monitor - 313002311
$231.82 -
Plastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$179.67 -
Blue Sea Systems M2 OLED Digital Tank Monitor - 1839
$389.74 -
Vetus Universal Synthetic Tank
$230.36 - $1,229.05 -
Maretron Tank Level NMEA 2000 Adapter - TLA100-01
$388.33 -
Dometic 20 HTS-VRT Basic Series Waste Water Holding Tank System - 18 Gal - 322840202
$817.24 -
Groco Tank Level Sensor - 08-0004-02
$350.26 -
Veratron Waste Water Level Sensor with Sealing Kit #930
$506.42 - $967.98 -
Vetus Inspection Lid
$25.98 - $93.64 -
Veratron Fresh Water Level Sensor with Sealing Kit #370
$317.21 - $778.76 -
Nauta Flexible Tank Fill Fitting - FTP2221
$92.23 -
Dometic Universal Holding Tank Cleanout Kit - 307238685
$71.08 -
Groco SweetTank Odor Neutralization System
$513.84 - $529.35 -
Nauta Flexible Tank Drawing Nipple - FTP311
$33.01 -
Veratron VDO Fresh Water Level Sender - 226-828-001-001K
$757.56 -
Vetus No-Smell Filter with Connections
$120.43 - $169.78 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$107.74 -
SCAD Technologies Internal Tank Sensor - 10021
$104.92 -
Vetus Flexible Tank Fitting
$30.19 -
Vetus Universal Tank Float Sensor
$220.54 - $324.88 -
Vetus Fuel Connection Kit Filler
$291.06 - $319.28 -
Vetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$33.01 -
Vetus Ultrasonic Fluid Level Sensor
$248.74 - $260.02 -
LIST 3-Level Waste Tank Monitor - TM-332111
$337.59 -
Groco 4-Way Tank Selector Kit - TS-350-T
$251.58 -
Maretron TFT-5H-Focus Tube Kit - TFT-5H
$85.20 -
Blue Sea Mini OLED Tank Meter
$73.90 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$45.70 -
Todd Water Tank Relocation Kit - 90-2219
$106.33 -
Dometic Multi-Level Tank Monitor System
$511.00 -
Raritan Tank Sensor - Float Style - STCFL
$150.04 -
Todd Holding Tank Fitting Adapter Kit - 93-2220
$35.83 -
Raritan Tank Sensor Module Kit - 15101
$175.42 -
Raritan Holding Tank Monitor Indicator Panel - 1520012
$382.69
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!