Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Todd Fresh Water/Waste Water Holding Tank
$124.71 - $497.25 -
Dometic DVF Holding Tank Vent Filter Replacement Cartridge - 309311004
$161.32 -
SCAD TM1 Tank Monitor with External Sensor Strip - 10040
$289.63 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$542.06 -
Dometic 20 HTS-VRT Basic Series Waste Water Holding Tank System - 18 Gal - 322840202
$817.24 -
14% offNauta Flexible Fresh Water Tank
$506.81 - $859.32$430.89 - $730.52 -
Vetus Flexible Fresh Water Tank
$272.76 - $513.87 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$213.49 -
Vetus Flexible Waste Water Holding Tank
$381.33 - $753.57 -
14% offNauta Heavy Duty Diesel Fuel and Waste Tank - 14.5 Gal - FT915122
$776.12$659.80 -
Plastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$221.99 -
Maretron NMEA 2000 Tank Level Monitor - TLM100-01
$371.41 -
Dometic DTM01 Holding Tank Monitor - 313002311
$231.82 -
Plastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$179.67 -
Veratron Waste Water Level Sensor with Sealing Kit #930
$506.42 - $967.98 -
Veratron Fresh Water Level Sensor with Sealing Kit #370
$317.21 - $778.76 -
Dometic 25 HTS-HRZ Basic Series Waste Water Holding Tank System - 25 Gal - 322800251
$736.86 -
Scepter Potable Water Jerry Can - 5 Gal - 04933
$38.70 -
Dometic Multi-Level Tank Monitor System
$511.00 -
Nauta Flexible Tank Fill Fitting - FTP2221
$92.23 -
LIST 3-Level Waste Tank Monitor - TM-332111
$337.59 -
Vetus Inspection Lid
$25.98 - $90.82 -
Groco Tank Level Sensor - 08-0004-02
$350.26 -
Vetus Universal Synthetic Tank
$236.37 - $1,197.52 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$107.74 -
Maretron Tank Level NMEA 2000 Adapter - TLA100-01
$417.94 -
Veratron VDO Fresh Water Level Sender - 226-828-001-001K
$757.56 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$45.70 -
Dometic Universal Holding Tank Cleanout Kit - 307238685
$71.08 -
SCAD Technologies Internal Tank Sensor - 10021
$147.22 -
Blue Sea Mini OLED Tank Meter
$73.90 -
Todd Water Tank Relocation Kit - 90-2219
$106.33 -
Groco 4-Way Tank Selector Kit - TS-350-T
$251.58 -
Vetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$33.01 -
Maretron TFT-5H-Focus Tube Kit - TFT-5H
$90.84 -
Vetus No-Smell Filter with Connections
$120.43 - $169.78 -
Nauta Flexible Tank Drawing Nipple - FTP311
$33.01 -
Groco SweetTank Odor Neutralization System
$513.84 - $529.35 -
Dometic Holding Tank Flange Kit - 307230272
$61.21 -
Vetus Flexible Tank Fitting
$30.19 -
Vetus Universal Tank Float Sensor
$220.54 - $324.88 -
Victron Energy GX Tank 140 System Monitoring - BPP920140100
$139.64 -
Vetus Fuel Connection Kit Filler
$291.06 - $319.28 -
Vetus Ultrasonic Fluid Level Sensor
$248.74 -
Todd Holding Tank Fitting Adapter Kit - 93-2223
$35.83 -
Todd Holding Tank Fitting Adapter Kit - 93-2220
$35.83 -
Raritan Tank Sensor Module Kit - 15101
$175.42 -
Vetus Right Angle Hose Connection
$34.42
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!