Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Dometic DVF Holding Tank Vent Filter Replacement Cartridge - 9108849515
$179.70 -
Todd Fresh Water/Waste Water Holding Tank
$124.71 - $497.25 -
SCAD TM1 Tank Monitor with External Sensor Strip - 10040
$289.63 -
Vetus Flexible Fresh Water Tank
$275.58 - $582.96 -
9% offPlastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$185.35$166.88 -
Maretron NMEA 2000 Tank Level Monitor - TLM100-01
$371.41 -
Vetus Flexible Waste Water Holding Tank
$615.43 - $1,259.76 -
14% offNauta Flexible Fresh Water Tank
$506.81 - $859.32$430.89 - $730.52 -
9% offPlastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$269.95$243.02 -
Vetus Universal Synthetic Tank
$266.40 - $1,364.20 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$213.49 -
9% offPlastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$162.79$146.57 -
SCAD Technologies External Tape-On Tank Sensor - 10022
$110.56 -
Dometic 20 HTS-VRT Basic Series Waste Water Holding Tank System - 18 Gal - 9108555503
$896.20 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$597.05 - $614.09 -
9% offPlastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$238.93$215.10 -
14% offNauta Heavy Duty Diesel Fuel and Waste Tank - 14.5 Gal - FT915122
$776.12$659.80 -
Dometic DTM01 Holding Tank Monitor - 9108688891
$254.38 -
Nauta Flexible Tank Fill Fitting - FTP2221
$92.23 -
Dometic Multi-Level Tank Monitor System
$563.17 -
Raritan TankAssure Control Panel with Sensor - 15600
$893.14 -
SCAD Technologies Internal Tank Sensor - 10021
$147.22 -
Vetus Ultrasonic Fluid Level Sensor
$281.17 - $295.27 -
Vetus Inspection Lid
$28.78 - $106.33 -
Groco 4-Way Tank Selector Kit - TS-350-T
$264.27 -
Vetus Flexible Tank Fitting
$34.42 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$107.74 -
Blue Sea Systems M2 OLED Digital Tank Monitor - 1839
$389.74 -
Maretron TFT-5H-Focus Tube Kit - TFT-5H
$90.84 -
Dometic Universal Holding Tank Cleanout Kit - 9108731133
$78.13 -
Groco Tank Level Sensor - 08-0004-02
$346.03 -
Vetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$37.24 -
Dometic 25 HTS-HRZ Basic Series Waste Water Holding Tank System - 25 Gal - 9108555494
$810.18 -
Vetus Fuel Connection Kit Filler
$386.94 - $458.87 -
Vetus Connection Kit
$104.92 - $126.10 -
Vetus No-Smell Filter with Connections
$150.04 - $190.93 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$45.70 -
Nauta Flexible Tank Drawing Nipple - FTP311
$33.01 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$120.45 -
Veratron Fresh Water Level Sensor with Sealing Kit #370
$317.21 - $570.01 -
Vetus Universal Tank Float Sensor
$248.74 - $365.77 -
LIST 3-Level Waste Tank Monitor - TM-332111
$337.59 -
Dometic Holding Tank Flange Kit - 9108553349
$68.26 -
Groco SweetTank Odor Neutralization System
$513.84 - $525.12 -
Vetus Right Angle Hose Connection
$38.65 -
Raritan TankAssure Sensor Kit - 15610
$551.91 -
Raritan Tank Sensor - Float Style - STCFL
$155.68 -
Nauta Flexible Tank Vent Fitting - FTPE300
$21.35
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!