Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Nauta Flexible Tank Drawing Nipple - FTP300
$16.87 -
Nauta Flexible Tank Drawing Nipple - FTP1300
$17.66 -
Nauta Flexible Tank Vent Fitting - FTPE300
$19.71 -
Nauta Flexible Tank Drawing Nipple - FTP400
$20.98 -
Nauta Flexible Tank Fill Fitting - FTP1210
$23.32 -
Vetus Inspection Lid
$25.80 - $92.98 -
Vetus Waste Tank Repair Set - REPSETOT
$27.80 -
Vetus Water Tank Fitting
$29.98 -
Nauta Flexible Tank Drawing Nipple - FTP311
$29.98 -
Todd Holding Tank Fitting Adapter Kit - 93-2222
$35.58 -
Scepter Potable Water Jerry Can - 5 Gal - 04933
$38.43 -
Todd Holding Tank Fitting Adapter Kit - 93-2220
$39.78 -
Todd Holding Tank Fitting Adapter Kit - 93-2223
$42.58 -
Raritan Tank Monitor Indicator Panel Wire Harness - 152WH
$49.58 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$50.98 -
Dometic Holding Tank Flange Kit - 307230272
$56.58 -
Dometic Universal Holding Tank Cleanout Kit - 307238685
$64.98 -
Blue Sea Mini OLED Tank Meter
$66.38 - $67.78 -
Vetus Fuel Tank Float Sensor - FSENSOR
$73.38 -
Nauta Flexible Tank Fill Fitting - FTP2221
$84.58 -
SCAD Technologies External Tape-On Tank Sensor - 10022
$85.98 -
Veratron Level Sensor Single Station with Seal Kit - 226-801-015-001G
$95.08 -
Todd Water Tank Relocation Kit - 90-2218
$95.78 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$97.18 -
Dometic Holding Tank Diptube Kit - 385310660
$98.62 -
SCAD Technologies Internal Tank Sensor - 10021
$102.78 -
Todd Water Tank Relocation Kit - 90-2219
$105.58 -
Plastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$112.60 -
Vetus Diesel Inspection Lid - ILT120B
$126.60 -
34% offLIST Single-Level Water Tank Alarm - 1/4 Alert - TM-131111
$200.80$130.73 -
Raritan Tank Sensor - Float Style - STCFL
$150.38 -
Plastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$154.61 -
Blue Sea Systems VSM 422 Vessel Systems Monitor Tank Sender
$160.18 - $161.58 -
Todd Fresh Water/Waste Water Holding Tank
$163.03 - $495.13 -
Raritan Tank Sensor Module Kit - 15101
$174.18 -
Plastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$178.42 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$213.38 -
LIST Single-Level Waste Tank Alarm - 3/4 Alert - TM-132111
$214.80 -
Vetus Universal Tank Float Sensor
$218.98 - $322.58 -
Dometic DTM01 Holding Tank Monitor - 313002311
$220.38 -
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 -
Vetus Universal Synthetic Tank
$234.70 - $1,220.34 -
Plastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$235.83 -
Vetus Ultrasonic Fluid Level Sensor
$246.98 - $258.18 -
Groco 4-Way Tank Selector Kit - TS-350-T
$249.80 -
SCAD TM1 Tank Monitor with External Sensor Strip - 10040
$262.38 -
19% offLIST 3-Level Water Tank Monitor - TM-331111
$332.40$266.04
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!