Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Todd Fresh Water/Waste Water Holding Tank
$167.67 - $640.29 -
SCAD TM1 Tank Monitor with External Sensor Strip - 10040
$269.86 -
Vetus Flexible Fresh Water Tank
$278.55 - $524.79 -
Groco Tank Level Sensor - 08-0004-02
$468.58 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$517.58 -
Vetus Flexible Waste Water Holding Tank
$389.43 - $769.59 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$219.46 -
Dometic 25 HTS-HRZ Basic Series Waste Water Holding Tank System - 25 Gal - 322800251
$712.20 -
Dometic 20 HTS-VRT Basic Series Waste Water Holding Tank System - 18 Gal - 322840202
$788.53 -
SCAD Technologies External Tape-On Tank Sensor - 10022
$88.42 -
17% offPlastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$242.55$199.91 -
17% offPlastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$159.01$130.89 -
Dometic DTM01 Holding Tank Monitor - 313002311
$226.66 -
Blue Sea Systems M2 OLED Digital Tank Monitor - 1839
$398.02 -
17% offPlastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$115.80$95.19 -
Raritan Holding Tank Monitor - 1510012
$729.22 -
Nauta Flexible Fresh Water Tank
$517.58 - $877.59 -
Veratron VDO Fresh Water Level Sender - 226-828-001-001K
$555.27 -
Nauta Heavy Duty Diesel Fuel and Waste Tank - 14.5 Gal - FT915122
$792.62 -
Vetus Universal Synthetic Tank
$241.38 - $1,255.19 -
Scepter Potable Water Jerry Can - 5 Gal - 04933
$39.51 -
Dometic Multi-Level Tank Monitor System
$488.74 -
17% offPlastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$183.50$151.12 -
Dometic Universal Holding Tank Cleanout Kit - 307238685
$66.82 -
Vetus Flexible Tank Fitting
$30.82 -
SCAD Technologies Internal Tank Sensor - 10021
$105.70 -
Vetus Diesel Inspection Lid - ILT120B
$130.20 -
Todd Water Tank Relocation Kit - 90-2219
$108.58 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$53.86 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$99.94 -
Nauta Flexible Tank Fill Fitting - FTP2221
$86.98 -
Raritan Holding Tank Monitor Indicator Panel - 1520012
$390.82 -
Blue Sea Systems VSM 422 Vessel Systems Monitor Tank Sender
$164.74 - $166.18 -
Groco 4-Way Tank Selector Kit - TS-350-T
$256.92 -
Dometic Holding Tank Flange Kit - 307230272
$58.18 -
Vetus Ultrasonic Fluid Level Sensor
$254.02 - $265.54 -
Todd Water Tank Relocation Kit - 90-2218
$98.50 -
12% offLIST 3-Level Waste Tank Monitor - TM-332111
$341.88$298.61 -
Dometic Holding Tank Diptube Kit - 385310660
$82.70 -
Nauta Flexible Tank Fill Fitting - FTP1210
$23.97 -
Raritan TankAssure Control Panel with Sensor - 15600
$848.77 -
Groco SweetTank Odor Neutralization System
$605.40 - $660.12 -
Nauta Flexible Tank Drawing Nipple - FTP311
$30.82 -
Vetus Universal Tank Float Sensor
$225.22 - $331.78 -
Blue Sea Mini OLED Tank Meter
$69.70 -
Nauta Flexible Tank Vent Fitting - FTPE300
$20.25 -
Veratron Level Sensor Single Station with Seal Kit - 226-801-015-001G
$97.78 -
Todd Holding Tank Fitting Adapter Kit - 93-2223
$43.78
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!