Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Raritan TankAssure Control Panel with Sensor - 15600
$882.61 -
Nauta Heavy Duty Diesel Fuel and Waste Tank - 14.5 Gal - FT915122
$770.62 -
Raritan Holding Tank Monitor - 1510012
$708.98 -
Veratron Marine NMEA 2000 Liquid Level Sensor - B00041501
$689.82 -
Groco SweetTank Odor Neutralization System
$587.20 - $597.00 -
Veratron VDO Fresh Water Level Sender - 226-828-001-001K
$539.86 -
Raritan TankAssure Sensor Kit - 15610
$529.80 -
Nauta Flexible Fresh Water Tank
$503.22 - $812.63 -
Raritan TankAssure NMEA2000 Adapter - 15630
$494.78 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$487.82 -
Dometic Multi-Level Tank Monitor System
$475.18 -
Groco Tank Level Sensor - 08-0004-02
$455.58 -
Blue Sea Systems M2 OLED Digital Tank Monitor - 1839
$386.98 -
Raritan Holding Tank Monitor Indicator Panel - 1520012
$379.98 -
Vetus Flexible Waste Water Holding Tank
$378.63 - $748.23 -
Veratron Waste Water Level Sensor with Sealing Kit #930
$360.94 - $689.82 -
9% offLIST 3-Level Waste Tank Monitor - TM-332111
$332.40$299.22 -
Vetus Flexible Fresh Water Tank
$270.83 - $510.23 -
19% offLIST 3-Level Water Tank Monitor - TM-331111
$332.40$266.04 -
SCAD TM1 Tank Monitor with External Sensor Strip - 10040
$262.38 -
Groco 4-Way Tank Selector Kit - TS-350-T
$249.80 -
Vetus Ultrasonic Fluid Level Sensor
$246.98 - $258.18 -
Vetus Universal Synthetic Tank
$234.70 - $1,220.34 -
Veratron Fresh Water Level Sensor with Sealing Kit #930
$226.12 - $550.80 -
Veratron Fresh Water Level Sensor with Sealing Kit #370
$226.12 - $555.00 -
Dometic DTM01 Holding Tank Monitor - 313002311
$220.38 -
Vetus Universal Tank Float Sensor
$218.98 - $322.58 -
LIST Single-Level Waste Tank Alarm - 3/4 Alert - TM-132111
$214.80 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$213.38 -
Raritan Tank Sensor Module Kit - 15101
$174.18 -
Todd Fresh Water/Waste Water Holding Tank
$163.03 - $495.13 -
Blue Sea Systems VSM 422 Vessel Systems Monitor Tank Sender
$160.18 - $161.58 -
Raritan Tank Sensor - Float Style - STCFL
$150.38 -
34% offLIST Single-Level Water Tank Alarm - 1/4 Alert - TM-131111
$200.80$130.73 -
Vetus Diesel Inspection Lid - ILT120B
$126.60 -
Todd Water Tank Relocation Kit - 90-2219
$105.58 -
SCAD Technologies Internal Tank Sensor - 10021
$102.78 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$97.18 -
Todd Water Tank Relocation Kit - 90-2218
$95.78 -
Veratron Level Sensor Single Station with Seal Kit - 226-801-015-001G
$95.08 -
SCAD Technologies External Tape-On Tank Sensor - 10022
$85.98 -
Nauta Flexible Tank Fill Fitting - FTP2221
$84.58 -
Vetus Fuel Tank Float Sensor - FSENSOR
$73.38 -
Blue Sea Mini OLED Tank Meter
$66.38 - $67.78 -
Dometic Universal Holding Tank Cleanout Kit - 307238685
$64.98 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$50.98 -
Raritan Tank Monitor Indicator Panel Wire Harness - 152WH
$49.58 -
Todd Holding Tank Fitting Adapter Kit - 93-2223
$42.58
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!