Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Dometic Holding Tank Flange Kit - 307230272
$56.58 -
Todd Water Tank Relocation Kit - 90-2218
$78.98 -
Raritan TankAssure Control Panel with Sensor - 15600
$825.21 -
Vetus Curved Extraction Pipe - WTS78038B
$62.18 -
Vetus Right Angle Hose Connection
$34.18 -
Blue Sea Mini OLED Tank Meter
$67.78 -
Veratron Level Sensor Single Station with Seal Kit - 226-801-015-001G
$95.08 -
Raritan Holding Tank Monitor Indicator Panel - 1520012
$379.98 -
LIST Single-Level Waste Tank Alarm - 3/4 Alert - TM-132111
$217.60 -
Dometic Holding Tank Diptube Kit - 385310660
$80.42 -
Raritan Tank Sensor Module Kit - 15101
$174.18 -
Nauta Flexible Tank Fill Fitting - FTP1210
$23.32 -
53% offOceanic Systems 4-20mA Tank Level Adaptor - 4291
$378.58$175.60 -
Raritan Tank Sensor - Float Style - STCFL
$150.38 -
Todd Holding Tank Fitting Adapter Kit - 93-2223
$35.58 -
Dometic 15 HTS-VRT Basic Series Waste Water Holding Tank System - 15 Gal - 322840152
$867.42 -
Nauta Flexible Tank Vent Fitting - FTPE300
$19.71 -
56% offOceanic Systems Deck-Mounted Water Gauge - 5250-W
$455.58$196.60 -
Maretron Tank Level Sender - TLM150-01
$364.58 -
Veratron OceanLink Fresh Water Gauge - 52 mm (2 1/16")
$91.60 -
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 -
Todd Holding Tank Fitting Adapter Kit - 93-2222
$29.98 -
9% offNauta Flexible Tank Drawing Nipple - FTP1300
$17.66$15.96 -
Nauta Flexible Tank Drawing Nipple - FTP400
$20.98 -
Perko Inlet Check Valve - 0635DP0
$22.90 -
Vetus Connection Kit
$88.78 - $107.01 -
Raritan Tank Monitor Indicator Panel Wire Harness - 152WH
$49.58 -
Nauta Flexible Tank Drawing Nipple - FTP300
$16.87 -
56% offOceanic Systems Submersible Hydrostatic Sensor
$455.58$196.60 -
Maretron NMEA 2000 Tank Temperature Immersion Probe - TP-IP-1
$196.58 -
Veratron Waste Water Level Sensor with Sealing Kit #930
$360.94 - $689.82 -
Victron Energy VE.Can Resistive Tank Sender Adapter - BPP900600100
$464.72 -
Raritan TankAssure Sensor Kit - 15610
$500.40 -
Raritan TankAssure NMEA2000 Adapter - 15630
$547.98 -
34% offLIST Single-Level Water Tank Alarm - 1/4 Alert - TM-131111
$200.80$130.73 -
54% offOceanic Systems Panel-Mounted Holding Tank Pumpout Gauge - 3350-HTPO
$385.58$175.60
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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!