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 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$597.05 - $614.09 -
Plastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$185.35 -
Plastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$162.79 -
Vetus Flexible Fresh Water Tank
$275.58 - $582.96 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$213.49 -
Dometic 20 HTS-VRT Basic Series Waste Water Holding Tank System - 18 Gal - 9108555503
$896.20 -
Maretron NMEA 2000 Tank Level Monitor - TLM100-01
$371.41 -
Plastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$269.95 -
Vetus Flexible Waste Water Holding Tank
$615.43 - $1,259.76 -
Plastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$238.93 -
Raritan TankAssure Control Panel with Sensor - 15600
$893.14 -
14% offNauta Flexible Fresh Water Tank
$506.81 - $859.32$430.89 - $730.52 -
SCAD Technologies External Tape-On Tank Sensor - 10022
$110.56 -
Vetus Inspection Lid
$28.78 - $106.33 -
Dometic DTM01 Holding Tank Monitor - 9108688891
$254.38 -
Groco Tank Level Sensor - 08-0004-02
$346.03 -
Nauta Flexible Tank Fill Fitting - FTP2221
$92.23 -
SCAD Technologies Internal Tank Sensor - 10021
$147.22 -
14% offNauta Heavy Duty Diesel Fuel and Waste Tank - 14.5 Gal - FT915122
$776.12$659.80 -
Vetus Universal Synthetic Tank
$266.40 - $1,364.20 -
Dometic Multi-Level Tank Monitor System
$563.17 -
Dometic 25 HTS-HRZ Basic Series Waste Water Holding Tank System - 25 Gal - 9108555494
$810.18 -
Dometic Universal Holding Tank Cleanout Kit - 9108731133
$78.13 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$107.74 -
Scepter Potable Water Jerry Can - 5 Gal - 04933
$38.70 -
Raritan TankAssure Sensor Kit - 15610
$551.91 -
LIST 3-Level Waste Tank Monitor - TM-332111
$337.59 -
Maretron TFT-5H-Focus Tube Kit - TFT-5H
$90.84 -
Groco 4-Way Tank Selector Kit - TS-350-T
$264.27 -
Vetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$37.24 -
Veratron Fresh Water Level Sensor with Sealing Kit #370
$317.21 - $570.01 -
Vetus Universal Tank Float Sensor
$248.74 - $365.77 -
Vetus Ultrasonic Fluid Level Sensor
$281.17 - $295.27 -
Raritan Tank Sensor - Float Style - STCFL
$155.68 -
Vetus Flexible Tank Fitting
$34.42 -
Dometic Holding Tank Flange Kit - 9108553349
$68.26 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$45.70 -
Nauta Flexible Tank Drawing Nipple - FTP311
$33.01 -
Vetus Connection Kit
$104.92 - $126.10 -
Vetus Right Angle Hose Connection
$38.65 -
Groco SweetTank Odor Neutralization System
$513.84 - $525.12 -
Vetus No-Smell Filter with Connections
$150.04 - $190.93 -
Thetford Tecma Field-Effect Tank Sensor
$189.47 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$120.45 -
Dometic Holding Tank Diptube Kit - 9108558205
$89.45
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!