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 -
Plastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$185.35 -
Plastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$269.95 -
Vetus Flexible Fresh Water Tank
$275.58 - $582.96 -
Vetus Universal Synthetic Tank
$266.40 - $1,364.20 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$597.05 - $614.09 -
Dometic 20 HTS-VRT Basic Series Waste Water Holding Tank System - 18 Gal - 9108555503
$896.20 -
Plastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$162.79 -
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 -
Raritan TankAssure Control Panel with Sensor - 15600
$893.14 -
SCAD Technologies External Tape-On Tank Sensor - 10022
$110.56 -
Plastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$238.93 -
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 -
Groco Tank Level Sensor - 08-0004-02
$346.03 -
SCAD Technologies Internal Tank Sensor - 10021
$147.22 -
Vetus Inspection Lid
$28.78 - $106.33 -
Vetus Ultrasonic Fluid Level Sensor
$281.17 - $295.27 -
Dometic 25 HTS-HRZ Basic Series Waste Water Holding Tank System - 25 Gal - 9108555494
$810.18 -
Vetus Flexible Tank Fitting
$34.42 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$107.74 -
Maretron TFT-5H-Focus Tube Kit - TFT-5H
$90.84 -
Raritan TankAssure Sensor Kit - 15610
$551.91 -
Groco 4-Way Tank Selector Kit - TS-350-T
$264.27 -
Vetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$37.24 -
Vetus Connection Kit
$104.92 - $126.10 -
Vetus Universal Tank Float Sensor
$248.74 - $365.77 -
Veratron Fresh Water Level Sensor with Sealing Kit #370
$317.21 - $570.01 -
Dometic Universal Holding Tank Cleanout Kit - 9108731133
$78.13 -
Vetus No-Smell Filter with Connections
$150.04 - $190.93 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$45.70 -
LIST 3-Level Waste Tank Monitor - TM-332111
$337.59 -
Dometic Holding Tank Flange Kit - 9108553349
$68.26 -
Raritan Tank Sensor - Float Style - STCFL
$155.68 -
Nauta Flexible Tank Drawing Nipple - FTP311
$33.01 -
Groco SweetTank Odor Neutralization System
$513.84 - $525.12 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$120.45 -
Vetus Right Angle Hose Connection
$38.65 -
Todd Holding Tank Fitting Adapter Kit - 93-2220
$35.83 -
Veratron VDO Fresh Water Level Sender - 226-828-001-001K
$757.56 -
Nauta Flexible Tank Vent Fitting - FTPE300
$21.35 -
Vetus Curved Extraction Pipe - WTS78038B
$72.49
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!