Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Raritan Holding Tank Monitor Indicator Panel - 1520012
$379.98 -
Blue Sea Mini OLED Tank Meter
$69.18 - $73.38 -
Nauta Flexible Tank Vent Fitting - FTPE300
$19.71 -
Dometic Holding Tank Diptube Kit - 385310660
$80.42 -
Dometic Holding Tank Flange Kit - 307230272
$56.58 -
Vetus Curved Extraction Pipe - WTS78038B
$62.18 -
Vetus Ultrasonic Fluid Level Sensor
$246.98 - $258.18 -
Vetus Right Angle Hose Connection
$34.18 -
Veratron Fresh Water Level Sensor with Sealing Kit #370
$249.57 - $612.47 -
Victron Energy GX Tank 140 System Monitoring - BPP920140100
$138.66 -
Todd Holding Tank Fitting Adapter Kit - 93-2223
$35.58 -
Raritan Tank Sensor Module Kit - 15101
$174.18 -
Raritan Tank Sensor - Float Style - STCFL
$150.38 -
Veratron Level Sensor Single Station with Seal Kit - 226-801-015-001G
$104.93 -
Nauta Flexible Tank Fill Fitting - FTP1210
$23.32 -
Dometic 15 HTS-VRT Basic Series Waste Water Holding Tank System - 15 Gal - 322840152
$867.42 -
Perko Inlet Check Valve - 0635DP0
$22.90 -
LIST 3-Level Water Tank Monitor - TM-331111
$335.20 -
Vetus Fuel Tank Float Sensor - FSENSOR
$73.38 -
Vetus Waste Tank Repair Set - REPSETOT
$27.80 -
Veratron OceanLink Fresh Water Gauge - 52 mm (2 1/16")
$122.40 -
Todd Holding Tank Fitting Adapter Kit - 93-2222
$29.98 -
56% offOceanic Systems Deck-Mounted Water Gauge - 5250-W
$455.58$196.60 -
9% offNauta Flexible Tank Drawing Nipple - FTP1300
$17.66$15.96 -
Nauta Flexible Tank Drawing Nipple - FTP400
$20.98 -
Vetus Connection Kit
$88.78 - $107.01 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$503.22 -
Maretron NMEA 2000 Tank Temperature Immersion Probe - TP-IP-1
$196.58 -
Veratron Fresh Water Level Sensor with Sealing Kit #930
$249.57 - $606.80 -
Raritan Tank Monitor Indicator Panel Wire Harness - 152WH
$49.58 -
56% offOceanic Systems Submersible Hydrostatic Sensor
$455.58$196.60 -
Nauta Flexible Tank Drawing Nipple - FTP300
$16.87 -
SCAD Technologies Adapter Plate - 10029
$57.98 -
Dometic 20 HTS-VRT Basic Series Waste Water Holding Tank System - 18 Gal - 322840202
$766.65 -
Dometic 28 HTS-T Waste Water Holding Tank System with Pump - 28 Gal - 322012812
$1,938.44 -
Dometic 30 HTS-HRZ Basic Series Waste Water Holding Tank System - 28 Gal - 322840301
$793.25 -
34% offLIST Single-Level Water Tank Alarm - 1/4 Alert - TM-131111
$200.80$130.73 -
Veratron Marine NMEA 2000 Liquid Level Sensor - B00041501
$1,165.40 -
Veratron Waste Water Level Sensor with Sealing Kit #930
$398.25 - $761.28 -
Victron Energy VE.Can Resistive Tank Sender Adapter - BPP900600100
$464.72 -
Faria Euro Black Potable Water Tank Level Gauge - 12831
$44.00 -
Groco Full Color Touchscreen LCD Monitor - 5" - LCD-5
$2,232.20 -
Raritan TankAssure Sensor Kit - 15610
$500.40 -
Raritan TankAssure NMEA2000 Adapter - 15630
$547.98 -
54% offOceanic Systems Panel-Mounted Holding Tank Pumpout Gauge - 3350-HTPO
$385.58$175.60 -
Groco Tank Level Sensor Assembly - 450 ASSY
$445.78 -
Dometic 10 HTS-T Waste Water Holding Tank System with Pump - 10 Gal - 322721012
$1,531.07 -
Dometic 12 HTS-VRT Basic Series Waste Water Holding Tank System - 11 Gal - 322840122
$681.11
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!