Welcome to Defender Canada! 
Water / Waste Holding Tanks
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9% offVetus Inspection Lid
$26.88 - $96.94$24.25 - $87.31 -
9% offVetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$38.54$34.75 -
9% offRaritan Holding Tank Monitor - 1510012
$739.34$665.47 -
Victron Energy GX Tank 140 System Monitoring - BPP920140100
$144.57 -
Veratron Waste Water Level Sensor with Sealing Kit #930
$376.39 - $719.36 -
Veratron OceanLink Fresh Water Gauge - 52 mm (2 1/16")
$93.89 -
14% offPlastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$245.91$209.12 -
14% offPlastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$117.40$99.88 -
14% offPlastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$186.04$158.23 -
14% offPlastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$161.21$137.12 -
9% offDometic Multi-Level Tank Monitor System
$495.52$446.03 -
14% offNauta Flexible Fresh Water Tank
$524.76 - $889.77$446.14 - $756.40 -
9% offVetus Flexible Tank Fitting
$31.24$28.18 -
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 -
9% offTodd Fresh Water/Waste Water Holding Tank
$136.41 - $428.61$122.84 - $385.83 -
Veratron VDO Fresh Water Level Sender - 226-828-001-001K
$562.98 -
Todd Holding Tank Fitting Adapter Kit - 93-2223
$37.08 -
9% offTodd Holding Tank Fitting Adapter Kit - 93-2220
$37.08$33.43 -
9% offTodd Holding Tank Fitting Adapter Kit - 93-2221
$47.30$42.63 -
9% offTodd Holding Tank Fitting Adapter Kit - 93-2222
$31.24$28.18 -
9% offTodd Water Tank Relocation Kit - 90-2219
$110.08$99.13 -
9% offScepter Potable Water Jerry Can - 5 Gal - 04933
$40.05$36.11 -
9% offSCAD Technologies External Tape-On Tank Sensor - 10022
$89.64$80.74 -
9% offSCAD Technologies Internal Tank Sensor - 10021
$107.16$96.51 -
9% offSCAD TM1 Tank Monitor with External Sensor Strip - 10040
$273.60$246.30 -
9% offSCAD TM2 Tank Monitor for Two Tanks - 10041
$222.50$200.31 -
9% offSCAD Technologies Adapter Plate - 10029
$60.44$54.46 -
9% offRaritan Tank Sensor - Float Style - STCFL
$156.80$141.18 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$96.29 -
53% offOceanic Systems 4-20mA Tank Level Adaptor - 4291
$394.78$183.10 -
56% offOceanic Systems Deck-Mounted Water Gauge - 5250-W
$475.08$205.00 -
54% offOceanic Systems Panel-Mounted Holding Tank Pumpout Gauge - 3350-HTPO
$402.08$183.10 -
56% offOceanic Systems Submersible Hydrostatic Sensor
$475.08$205.00 -
Nauta Flexible Tank Fill Fitting - FTP1210
$24.29 -
Nauta Flexible Tank Vent Fitting - FTPE300
$20.53 -
14% offNauta Heavy Duty Diesel Fuel and Waste Tank - 14.5 Gal - FT915122
$803.62$683.17 -
Nauta Flexible Tank Drawing Nipple - FTP1300
$18.40 -
Nauta Flexible Tank Drawing Nipple - FTP311
$31.24 -
Nauta Flexible Tank Drawing Nipple - FTP400
$21.86 -
Nauta Flexible Tank Fill Fitting - FTP2221
$88.18 -
Maretron NMEA 2000 Tank Level Monitor - TLM100-01
$302.95 -
Maretron NMEA 2000 Tank Temperature Immersion Probe - TP-IP-1
$168.41 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$100.47 -
Maretron Tank Level NMEA 2000 Adapter - TLA100-01
$354.27 -
Maretron Tank Level Sender - TLM150-01
$347.33 -
19% offLIST 3-Level Waste Tank Monitor - TM-332111
$346.62$277.42 -
19% offLIST 3-Level Water Tank Monitor - TM-331111
$346.62$277.42
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!