Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Dometic DVF Holding Tank Vent Filter Replacement Cartridge - 9108849515
$179.70 -
SCAD TM1 Tank Monitor with External Sensor Strip - 10040
$289.63 -
Todd Fresh Water/Waste Water Holding Tank
$124.71 - $497.25 -
Vetus Flexible Fresh Water Tank
$275.58 - $582.96 -
Plastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$185.35 -
Vetus Flexible Waste Water Holding Tank
$615.43 - $1,259.76 -
Plastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$269.95 -
Plastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$162.79 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$213.49 -
Plastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$238.93 -
14% offNauta Flexible Fresh Water Tank
$506.81 - $859.32$430.89 - $730.52 -
Maretron NMEA 2000 Tank Level Monitor - TLM100-01
$371.41 -
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 -
Nauta Flexible Tank Fill Fitting - FTP2221
$92.23 -
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 -
SCAD Technologies External Tape-On Tank Sensor - 10022
$110.56 -
Dometic DTM01 Holding Tank Monitor - 9108688891
$254.38 -
Raritan TankAssure Control Panel with Sensor - 15600
$893.14 -
Groco Tank Level Sensor - 08-0004-02
$346.03 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$107.74 -
Thetford Tecma Field-Effect Tank Sensor
$189.47 -
Dometic Multi-Level Tank Monitor System
$563.17 -
LIST 3-Level Waste Tank Monitor - TM-332111
$337.59 -
Groco 4-Way Tank Selector Kit - TS-350-T
$264.27 -
SCAD Technologies Internal Tank Sensor - 10021
$147.22 -
Vetus Flexible Tank Fitting
$34.42 -
Maretron Tank Level Sender - TLM150-01
$415.12 -
Blue Sea Systems M2 OLED Digital Tank Monitor - 1839
$389.74 -
Dometic Universal Holding Tank Cleanout Kit - 9108731133
$78.13 -
Vetus Ultrasonic Fluid Level Sensor
$281.17 - $295.27 -
Nauta Flexible Tank Drawing Nipple - FTP311
$33.01 -
Dometic 25 HTS-HRZ Basic Series Waste Water Holding Tank System - 25 Gal - 9108555494
$810.18 -
Vetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$37.24 -
Vetus Inspection Lid
$28.78 - $106.33 -
Vetus Fuel Connection Kit Filler
$386.94 - $458.87 -
Maretron TFT-5H-Focus Tube Kit - TFT-5H
$90.84 -
Vetus No-Smell Filter with Connections
$150.04 - $190.93 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$45.70 -
Veratron Fresh Water Level Sensor with Sealing Kit #370
$317.21 - $570.01 -
Veratron Level Sensor Single Station with Seal Kit - 226-801-015-001G
$133.21 -
Groco SweetTank Odor Neutralization System
$513.84 - $525.12 -
Dometic Holding Tank Flange Kit - 9108553349
$68.26 -
Vetus Universal Tank Float Sensor
$248.74 - $365.77 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$120.45 -
Johnson Viking Power 16 Grey Water Tank with Ultima Switch - 09-13384
$337.00 -
Raritan TankAssure Sensor Kit - 15610
$551.91
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!