Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Perko Inlet Check Valve - 0635DP0
$22.10 -
Vetus Universal Tank Float Sensor
$211.18 - $311.08 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$108.60 -
Veratron Fresh Water Level Sensor with Sealing Kit #370
$303.74 - $745.65 -
SCAD Technologies Adapter Plate - 10029
$55.93 -
Veratron VDO Fresh Water Level Sender - 226-828-001-001K
$725.35 -
Todd Holding Tank Fitting Adapter Kit - 93-2220
$34.33 -
Todd Water Tank Relocation Kit - 90-2219
$101.83 -
Vetus Fuel Connection Kit Filler
$278.70 - $305.72 -
Vetus Right Angle Hose Connection
$32.98 -
64% offOceanic Systems 4-20mA Tank Level Adaptor - 4291
$365.08$128.17 -
Todd Holding Tank Fitting Adapter Kit - 93-2222
$28.93 -
Nauta Flexible Tank Drawing Nipple - FTP1300
$17.05 -
Nauta Flexible Tank Fill Fitting - FTP1210
$23.85 -
LIST Single-Level Waste Tank Alarm - 3/4 Alert - TM-132111
$209.85 -
Dometic Holding Tank Diptube Kit - 385310660
$77.57 -
Todd Water Tank Relocation Kit - 90-2218
$76.18 -
Nauta Flexible Tank Drawing Nipple - FTP300
$17.24 -
Nauta Flexible Tank Drawing Nipple - FTP400
$21.46 -
Vetus Curved Extraction Pipe - WTS78038B
$59.98 -
Veratron OceanLink Fresh Water Gauge - 52 mm (2 1/16")
$122.10 -
Veratron Fresh Water Level Sensor with Sealing Kit #930
$303.74 - $733.65 -
Plastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$154.50 -
56% offOceanic Systems Deck-Mounted Water Gauge - 5250-W
$439.33$189.60 -
Vetus Waste Tank Repair Set - REPSETOT
$26.83 -
LIST 3-Level Water Tank Monitor - TM-331111
$323.25 -
Maretron NMEA 2000 Tank Temperature Immersion Probe - TP-IP-1
$211.18 -
Dometic 12 HTS-HRZ Basic Series Waste Water Holding Tank System - 11 Gal - 322840121
$698.68 -
Dometic 15 HTS-VRT Basic Series Waste Water Holding Tank System - 15 Gal - 322840152
$886.42 -
Dometic 30 HTS-HRZ Basic Series Waste Water Holding Tank System - 28 Gal - 322840301
$810.85 -
Raritan Tank Monitor Indicator Panel Wire Harness - 152WH
$47.83 -
Vetus Fuel Tank Float Sensor - FSENSOR
$70.78 -
Vetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$31.63 -
Vetus Connection Kit
$85.63 - $103.21 -
Groco Full Color Touchscreen LCD Monitor - 5" - LCD-5
$2,152.50 -
Faria Euro Black Potable Water Tank Level Gauge - 12831
$42.45 -
Veratron Marine NMEA 2000 Liquid Level Sensor - B00041501
$1,123.80 -
Veratron Waste Water Level Sensor with Sealing Kit #930
$484.90 - $926.81 -
Victron Energy VE.Can Resistive Tank Sender Adapter - BPP900600100
$448.14 -
39% offLIST Single-Level Water Tank Alarm - 1/4 Alert - TM-131111
$193.65$116.43 -
Groco Tank Level Sensor Assembly - 450 ASSY
$429.88 -
Dometic 10 HTS-T Waste Water Holding Tank System with Pump - 10 Gal - 322721012
$1,564.17 -
Dometic 12 HTS-VRT Basic Series Waste Water Holding Tank System - 11 Gal - 322840122
$695.96 -
Dometic 15 HTS-HRZ Basic Series Waste Water Holding Tank System - 15 Gal - 322840151
$885.07 -
Dometic 20 HTS-HRZ Basic Series Waste Water Holding Tank System - 18 Gal - 322840201
$768.89 -
Dometic 28 HTS-T Waste Water Holding Tank System with Pump - 28 Gal - 322012812
$2,020.44 -
Dometic 40 HTS-HRZ Basic Series Waste Water Holding Tank System - 34 Gal - 322840401
$906.70 -
Dometic 40 HTS-T Waste Water Holding Tank System with Pump - 40 Gal - 322014012
$2,108.28
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!