Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Vetus Ultrasonic Fluid Level Sensor
$246.98 - $258.18 -
Vetus Inspection Lid
$25.80 - $92.98 -
Vetus Diesel Inspection Lid - ILT120B
$126.60 -
Vetus Fuel Tank Float Sensor - FSENSOR
$73.38 -
Raritan Tank Monitor Indicator Panel Wire Harness - 152WH
$49.58 -
Raritan TankAssure NMEA2000 Adapter - 15630
$494.78 -
Raritan Holding Tank Monitor - 1510012
$708.98 -
Raritan Holding Tank Monitor Indicator Panel - 1520012
$379.98 -
Raritan Tank Sensor Module Kit - 15101
$174.18 -
Raritan TankAssure Control Panel with Sensor - 15600
$882.61 -
Raritan TankAssure Sensor Kit - 15610
$529.80 -
Blue Sea Systems VSM 422 Vessel Systems Monitor Tank Sender
$160.18 - $161.58 -
Groco 4-Way Tank Selector Kit - TS-350-T
$249.80 -
Vetus Universal Tank Float Sensor
$218.98 - $322.58 -
Vetus Universal Synthetic Tank
$234.70 - $1,220.34 -
Veratron Fresh Water Level Sensor with Sealing Kit #370
$226.12 - $555.00 -
Veratron Fresh Water Level Sensor with Sealing Kit #930
$226.12 - $550.80 -
Veratron Waste Water Level Sensor with Sealing Kit #930
$360.94 - $689.82 -
Veratron Level Sensor Single Station with Seal Kit - 226-801-015-001G
$95.08 -
Veratron Marine NMEA 2000 Liquid Level Sensor - B00041501
$689.82 -
Plastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$235.83 -
Plastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$112.60 -
Plastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$178.42 -
Plastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$154.61 -
Dometic Multi-Level Tank Monitor System
$475.18 -
Nauta Flexible Fresh Water Tank
$503.22 - $812.63 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$487.82 -
Vetus Water Tank Fitting
$29.98 -
Vetus Flexible Waste Water Holding Tank
$378.63 - $748.23 -
Vetus Flexible Fresh Water Tank
$270.83 - $510.23 -
Todd Fresh Water/Waste Water Holding Tank
$163.03 - $495.13 -
Vetus Waste Tank Repair Set - REPSETOT
$27.80 -
Veratron VDO Fresh Water Level Sender - 226-828-001-001K
$539.86 -
Todd Holding Tank Fitting Adapter Kit - 93-2223
$42.58 -
Todd Holding Tank Fitting Adapter Kit - 93-2220
$39.78 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$50.98 -
Todd Holding Tank Fitting Adapter Kit - 93-2222
$35.58 -
Todd Water Tank Relocation Kit - 90-2218
$95.78 -
Todd Water Tank Relocation Kit - 90-2219
$105.58 -
Scepter Potable Water Jerry Can - 5 Gal - 04933
$38.43 -
SCAD Technologies External Tape-On Tank Sensor - 10022
$85.98 -
SCAD Technologies Internal Tank Sensor - 10021
$102.78 -
SCAD TM1 Tank Monitor with External Sensor Strip - 10040
$262.38 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$213.38 -
Raritan Tank Sensor - Float Style - STCFL
$150.38 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$97.18 -
Nauta Flexible Tank Drawing Nipple - FTP1300
$17.66 -
Nauta Flexible Tank Drawing Nipple - FTP311
$29.98
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!