Welcome to Defender Canada! 
Water / Waste Holding Tanks
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14% offVetus Flexible Waste Water Holding Tank
$394.83 - $780.27$335.70 - $663.33 -
14% offVetus Flexible Fresh Water Tank
$282.41 - $532.07$240.15 - $452.36 -
14% offNauta Flexible Fresh Water Tank
$524.76 - $889.77$446.14 - $756.40 -
14% offNauta Heavy Duty Diesel Fuel and Waste Tank - 14.5 Gal - FT915122
$803.62$683.17 -
9% offGroco Tank Level Sensor - 08-0004-02
$355.36$319.89 -
Nauta Flexible Tank Fill Fitting - FTP2221
$88.18 -
9% offGroco SweetTank Odor Neutralization System
$530.58 - $539.34$478.89 - $504.08 -
14% offVetus Universal Tank Float Sensor
$228.34 - $336.38$194.18 - $286.01 -
9% offVetus Inspection Lid
$26.88 - $96.94$24.25 - $87.31 -
9% offGroco 4-Way Tank Selector Kit - TS-350-T
$260.48$234.49 -
Nauta Flexible Tank Drawing Nipple - FTP311
$31.24 -
9% offVetus Flexible Tank Fitting
$31.24$28.18 -
Nauta Flexible Tank Fill Fitting - FTP1210
$24.29 -
9% offVetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$38.54$34.75 -
14% offVetus Universal Synthetic Tank
$244.73 - $1,272.61$208.11 - $1,081.82 -
Nauta Flexible Tank Vent Fitting - FTPE300
$20.53 -
14% offVetus Right Angle Hose Connection
$38.54$32.85 -
Nauta Flexible Tank Drawing Nipple - FTP1300
$18.40 -
Nauta Flexible Tank Drawing Nipple - FTP300
$17.56 -
Nauta Flexible Tank Drawing Nipple - FTP400
$21.86 -
14% offVetus Ultrasonic Fluid Level Sensor
$257.54 - $269.22$219.00 - $228.93 -
14% offVetus Waste Tank Repair Set - REPSETOT
$28.97$24.72 -
14% offVetus Fuel Tank Float Sensor - FSENSOR
$76.50$65.12 -
14% offVetus Fuel Connection Kit Filler
$317.42 - $348.10$269.90 - $295.98 -
14% offVetus Connection Kit
$101.32 - $121.79$86.21 - $103.61 -
9% offGroco Full Color Touchscreen LCD Monitor - 5" - LCD-5
$2,186.22$1,967.66 -
9% off
Groco Tank Level Sensor Assembly - 450 ASSY
$464.86$418.44 -
14% offVetus Curved Extraction Pipe - WTS78038B
$70.66$60.15
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!