Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Dometic DVF Holding Tank Vent Filter Replacement Cartridge - 309311004
$174.06 -
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 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$574.49 - $591.53 -
Plastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$185.35 -
Plastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$269.95 -
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 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$213.49 -
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 -
Plastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$162.79 -
Dometic 25 HTS-HRZ Basic Series Waste Water Holding Tank System - 25 Gal - 322800251
$780.57 -
Maretron Tank Level NMEA 2000 Adapter - TLA100-01
$417.94 -
Nauta Flexible Tank Fill Fitting - FTP2221
$92.23 -
Blue Sea Systems M2 OLED Digital Tank Monitor - 1839
$389.74 -
Raritan TankAssure Control Panel with Sensor - 15600
$893.14 -
Vetus Universal Synthetic Tank
$266.40 - $1,364.20 -
Vetus Ultrasonic Fluid Level Sensor
$281.17 - $295.27 -
Dometic Multi-Level Tank Monitor System
$542.02 -
Vetus Inspection Lid
$28.78 - $106.33 -
Groco Tank Level Sensor - 08-0004-02
$346.03 -
Dometic DTM01 Holding Tank Monitor - 313002311
$244.51 -
SCAD Technologies Internal Tank Sensor - 10021
$147.22 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$107.74 -
Vetus Flexible Tank Fitting
$34.42 -
Vetus Universal Tank Float Sensor
$248.74 - $365.77 -
Dometic Universal Holding Tank Cleanout Kit - 307238685
$75.31 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$45.70 -
Dometic Holding Tank Flange Kit - 307230272
$65.44 -
Scepter Potable Water Jerry Can - 5 Gal - 04933
$38.70 -
Groco 4-Way Tank Selector Kit - TS-350-T
$264.27 -
Maretron TFT-5H-Focus Tube Kit - TFT-5H
$90.84 -
LIST 3-Level Waste Tank Monitor - TM-332111
$337.59 -
Vetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$37.24 -
Vetus Curved Extraction Pipe - WTS78038B
$72.49 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$120.45 -
Vetus No-Smell Filter with Connections
$150.04 - $190.93 -
Nauta Flexible Tank Drawing Nipple - FTP311
$33.01 -
Veratron Level Sensor Single Station with Seal Kit - 226-801-015-001G
$133.21 -
Todd Water Tank Relocation Kit - 90-2219
$106.33 -
Maretron NMEA 2000 Tank Temperature Immersion Probe - TP-IP-1
$205.03 -
Veratron VDO Fresh Water Level Sender - 226-828-001-001K
$757.56 -
Blue Sea Mini OLED Tank Meter
$73.90 -
Raritan Tank Sensor Module Kit - 15101
$175.42 -
Vetus Right Angle Hose Connection
$38.65
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!