Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Dometic DVF Holding Tank Vent Filter Replacement Cartridge - 309311004
$156.80 -
SCAD TM1 Tank Monitor with External Sensor Strip - 10040
$273.60 -
Todd Fresh Water/Waste Water Holding Tank
$136.41 - $428.61 -
Plastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$162.67 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$222.50 -
Plastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$118.86 -
Plastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$247.37 -
Vetus Flexible Waste Water Holding Tank
$394.83 - $780.27 -
Plastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$187.50 -
SCAD Technologies External Tape-On Tank Sensor - 10022
$89.64 -
Maretron NMEA 2000 Tank Level Monitor - TLM100-01
$329.08 -
Nauta Heavy Duty Diesel Fuel and Waste Tank - 14.5 Gal - FT915122
$803.62 -
Vetus Flexible Fresh Water Tank
$282.41 - $532.07 -
Dometic 20 HTS-VRT Basic Series Waste Water Holding Tank System - 18 Gal - 322840202
$799.47 -
Dometic 25 HTS-HRZ Basic Series Waste Water Holding Tank System - 25 Gal - 322800251
$722.08 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$524.76 -
Nauta Flexible Fresh Water Tank
$524.76 - $889.77 -
Groco Tank Level Sensor - 08-0004-02
$355.36 -
Nauta Flexible Tank Fill Fitting - FTP2221
$88.18 -
Dometic Multi-Level Tank Monitor System
$495.52 -
Raritan Holding Tank Monitor - 1510012
$739.34 -
SCAD Technologies Internal Tank Sensor - 10021
$107.16 -
Scepter Potable Water Jerry Can - 5 Gal - 04933
$40.05 -
Veratron VDO Fresh Water Level Sender - 226-828-001-001K
$562.98 -
Dometic DTM01 Holding Tank Monitor - 313002311
$229.80 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$101.32 -
Maretron Tank Level NMEA 2000 Adapter - TLA100-01
$384.56 -
Blue Sea Systems M2 OLED Digital Tank Monitor - 1839
$403.54 -
Dometic Universal Holding Tank Cleanout Kit - 307238685
$67.74 -
Groco SweetTank Odor Neutralization System
$530.58 - $539.34 -
LIST Single-Level Waste Tank Alarm - 3/4 Alert - TM-132111
$226.90 -
Groco 4-Way Tank Selector Kit - TS-350-T
$260.48 -
Nauta Flexible Tank Drawing Nipple - FTP311
$31.24 -
19% offLIST 3-Level Waste Tank Monitor - TM-332111
$346.62$277.42 -
Vetus Universal Tank Float Sensor
$228.34 - $336.38 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$123.24 -
Vetus Flexible Tank Fitting
$31.24 -
Vetus Universal Synthetic Tank
$244.73 - $1,272.61 -
Maretron Tank Level Sender - TLM150-01
$380.18 -
LIST 3-Level Water Tank Monitor - TM-331111
$349.54 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$47.30 -
Raritan Tank Sensor - Float Style - STCFL
$156.80 -
Blue Sea Mini OLED Tank Meter
$70.66 -
Maretron TFT-5H-Focus Tube Kit - TFT-5H
$79.44 -
Raritan Tank Sensor Module Kit - 15101
$181.62 -
SCAD Technologies Adapter Plate - 10029
$60.44 -
Vetus Ultrasonic Fluid Level Sensor
$257.54 - $269.22 -
Veratron Level Sensor Single Station with Seal Kit - 226-801-015-001G
$99.13
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!