Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Nauta Flexible Tank Fill Fitting - FTP1210
$22.51 -
Nauta Flexible Tank Vent Fitting - FTPE300
$19.03 -
Perko Inlet Check Valve - 0635DP0
$22.10 -
Vetus Ultrasonic Fluid Level Sensor
$238.18 - $248.98 -
Todd Water Tank Relocation Kit - 90-2218
$76.18 -
Veratron Fresh Water Level Sensor with Sealing Kit #370
$240.68 - $590.61 -
Victron Energy GX Tank 140 System Monitoring - BPP920140100
$133.73 -
Blue Sea Mini OLED Tank Meter
$70.78 -
Raritan Tank Sensor Module Kit - 15101
$167.98 -
Raritan Holding Tank Monitor Indicator Panel - 1520012
$366.43 -
Vetus Curved Extraction Pipe - WTS78038B
$59.98 -
Todd Holding Tank Fitting Adapter Kit - 93-2223
$34.33 -
Veratron Level Sensor Single Station with Seal Kit - 226-801-015-001G
$101.20 -
53% offOceanic Systems 4-20mA Tank Level Adaptor - 4291
$365.08$169.35 -
Dometic Holding Tank Diptube Kit - 385310660
$77.57 -
Raritan TankAssure Control Panel with Sensor - 15600
$795.76 -
LIST Single-Level Waste Tank Alarm - 3/4 Alert - TM-132111
$209.85 -
9% offNauta Flexible Tank Drawing Nipple - FTP1300
$17.05$15.41 -
Nauta Flexible Tank Drawing Nipple - FTP400
$18.85 -
Vetus Fuel Tank Float Sensor - FSENSOR
$70.78 -
Vetus Waste Tank Repair Set - REPSETOT
$26.83 -
Todd Holding Tank Fitting Adapter Kit - 93-2222
$28.93 -
Nauta Flexible Tank Drawing Nipple - FTP300
$16.29 -
56% offOceanic Systems Deck-Mounted Water Gauge - 5250-W
$439.33$189.60 -
Raritan Tank Sensor - Float Style - STCFL
$145.03 -
Vetus Connection Kit
$85.63 - $103.21 -
Veratron OceanLink Fresh Water Gauge - 52 mm (2 1/16")
$118.05 -
LIST 3-Level Water Tank Monitor - TM-331111
$323.25 -
Maretron NMEA 2000 Tank Temperature Immersion Probe - TP-IP-1
$189.58 -
56% offOceanic Systems Submersible Hydrostatic Sensor
$439.33$189.60 -
Raritan Tank Monitor Indicator Panel Wire Harness - 152WH
$47.83 -
Veratron Waste Water Level Sensor with Sealing Kit #930
$384.05 - $734.11 -
Victron Energy VE.Can Resistive Tank Sender Adapter - BPP900600100
$448.14 -
34% offLIST Single-Level Water Tank Alarm - 1/4 Alert - TM-131111
$193.65$126.08 -
54% offOceanic Systems Panel-Mounted Holding Tank Pumpout Gauge - 3350-HTPO
$371.83$169.35 -
Raritan TankAssure Sensor Kit - 15610
$482.55 -
Raritan TankAssure NMEA2000 Adapter - 15630
$528.43
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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!