Welcome to Defender Canada! 
Water / Waste Holding Tanks
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9% offTodd Fresh Water/Waste Water Holding Tank
$136.41 - $428.61$122.84 - $385.83 -
9% offDometic DVF Holding Tank Vent Filter Replacement Cartridge - 309311004
$165.56$149.07 -
9% offSCAD TM1 Tank Monitor with External Sensor Strip - 10040
$273.60$246.30 -
14% offPlastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$161.21$137.12 -
14% offPlastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$245.91$209.12 -
9% offSCAD TM2 Tank Monitor for Two Tanks - 10041
$222.50$200.31 -
9% offDometic 20 HTS-VRT Basic Series Waste Water Holding Tank System - 18 Gal - 322840202
$799.47$719.61 -
14% offVetus Flexible Waste Water Holding Tank
$394.83 - $780.27$335.70 - $663.33 -
Maretron NMEA 2000 Tank Level Monitor - TLM100-01
$302.95 -
9% offSCAD Technologies External Tape-On Tank Sensor - 10022
$89.64$80.74 -
14% offPlastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$117.40$99.88 -
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 -
Veratron VDO Fresh Water Level Sender - 226-828-001-001K
$562.98 -
14% offPlastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$186.04$158.23 -
Nauta Flexible Tank Fill Fitting - FTP2221
$88.18 -
9% offDometic 25 HTS-HRZ Basic Series Waste Water Holding Tank System - 25 Gal - 322800251
$722.08$649.96 -
9% offScepter Potable Water Jerry Can - 5 Gal - 04933
$40.05$36.11 -
9% offDometic Universal Holding Tank Cleanout Kit - 307238685
$67.74$61.03 -
9% offDometic Multi-Level Tank Monitor System
$495.52$446.03 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$96.29 -
9% offBlue Sea Systems M2 OLED Digital Tank Monitor - 1839
$403.54$363.25 -
19% offLIST 3-Level Waste Tank Monitor - TM-332111
$346.62$277.42 -
9% offRaritan Holding Tank Monitor - 1510012
$739.34$665.47 -
9% offSCAD Technologies Internal Tank Sensor - 10021
$107.16$96.51 -
9% offVetus Inspection Lid
$26.88 - $96.94$24.25 - $87.31 -
19% offLIST Single-Level Waste Tank Alarm - 3/4 Alert - TM-132111
$223.98$179.30 -
Maretron Tank Level Sender - TLM150-01
$347.33 -
Nauta Flexible Tank Drawing Nipple - FTP311
$31.24 -
9% off
Blue Sea Mini OLED Tank Meter
$69.20 - $70.66$62.34 - $63.66 -
9% offVetus Flexible Tank Fitting
$31.24$28.18 -
9% offTodd Water Tank Relocation Kit - 90-2219
$110.08$99.13 -
9% offRaritan Tank Sensor - Float Style - STCFL
$156.80$141.18 -
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 -
19% offLIST 3-Level Water Tank Monitor - TM-331111
$346.62$277.42 -
Nauta Flexible Tank Fill Fitting - FTP1210
$24.29 -
9% offVetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$38.54$34.75 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$100.47 -
Maretron Tank Level NMEA 2000 Adapter - TLA100-01
$354.27 -
Victron Energy GX Tank 140 System Monitoring - BPP920140100
$144.57 -
9% offSCAD Technologies Adapter Plate - 10029
$60.44$54.46 -
Nauta Flexible Tank Vent Fitting - FTPE300
$20.53 -
9% offDometic 15 HTS-VRT Basic Series Waste Water Holding Tank System - 15 Gal - 322840152
$904.56$814.19 -
Todd Holding Tank Fitting Adapter Kit - 93-2223
$37.08 -
9% offDometic 30 HTS-HRZ Basic Series Waste Water Holding Tank System - 28 Gal - 322840301
$827.21$744.57
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!