Welcome to Defender Canada! 
Water / Waste Holding Tanks
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9% offDometic DVF Holding Tank Vent Filter Replacement Cartridge - 309311004
$165.56$149.07 -
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 -
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 -
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% offDometic Universal Holding Tank Cleanout Kit - 307238685
$67.74$61.03 -
9% offDometic Multi-Level Tank Monitor System
$495.52$446.03 -
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 -
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 -
9% offDometic 15 HTS-VRT Basic Series Waste Water Holding Tank System - 15 Gal - 322840152
$904.56$814.19 -
9% offDometic 30 HTS-HRZ Basic Series Waste Water Holding Tank System - 28 Gal - 322840301
$827.21$744.57 -
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 -
9% offDometic DTM04 TankWatch 4-Level Tank Monitor System
$524.76$472.35 -
14% offVetus Waste Tank Repair Set - REPSETOT
$28.97$24.72 -
9% offDometic 10 HTS-T Waste Water Holding Tank System with Pump - 10 Gal - 322721012
$1,596.65$1,437.08 -
9% offDometic 28 HTS-T Waste Water Holding Tank System with Pump - 28 Gal - 322012812
$2,021.48$1,819.41 -
9% offDometic DTM01 Holding Tank Monitor - 313002311
$229.80$206.88 -
9% offDometic Holding Tank Diptube Kit - 385310660
$83.84$75.52 -
9% offDometic Holding Tank Flange Kit - 307230272
$58.98$53.14 -
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% offDometic 12 HTS-VRT Basic Series Waste Water Holding Tank System - 11 Gal - 322840122
$710.27$639.31 -
9% offDometic 15 HTS-HRZ Basic Series Waste Water Holding Tank System - 15 Gal - 322840151
$904.56$814.18 -
9% offDometic 20 HTS-HRZ Basic Series Waste Water Holding Tank System - 18 Gal - 322840201
$784.75$706.35 -
9% off
Dometic 40 HTS-HRZ Basic Series Waste Water Holding Tank System - 34 Gal - 322840401
$926.49$833.92 -
14% offVetus Curved Extraction Pipe - WTS78038B
$70.66$60.15 -
9% offDometic 12 HTS-HRZ Basic Series Waste Water Holding Tank System - 11 Gal - 322840121
$713.21$641.96
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!