Welcome to Defender Canada! 
Water / Waste Holding Tanks
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LIST Single-Level Waste Tank Alarm - 3/4 Alert - TM-132111
$217.60 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$213.38 -
56% offOceanic Systems Deck-Mounted Water Gauge - 5250-W
$455.58$196.60 -
56% offOceanic Systems Submersible Hydrostatic Sensor
$455.58$196.60 -
Maretron NMEA 2000 Tank Temperature Immersion Probe - TP-IP-1
$196.58 -
Plastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$179.82 -
53% offOceanic Systems 4-20mA Tank Level Adaptor - 4291
$378.58$175.60 -
54% offOceanic Systems Panel-Mounted Holding Tank Pumpout Gauge - 3350-HTPO
$385.58$175.60 -
Raritan Tank Sensor Module Kit - 15101
$174.18 -
Plastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$156.01 -
Dometic DVF Holding Tank Vent Filter Replacement Cartridge - 309311004
$150.38 -
Raritan Tank Sensor - Float Style - STCFL
$150.38 -
Victron Energy GX Tank 140 System Monitoring - BPP920140100
$138.66 -
Todd Fresh Water/Waste Water Holding Tank
$130.83 - $525.93 -
34% offLIST Single-Level Water Tank Alarm - 1/4 Alert - TM-131111
$200.80$130.73 -
Vetus No-Smell Filter with Connections
$119.58 - $168.58 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$118.20 -
Plastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$114.00 -
Todd Water Tank Relocation Kit - 90-2219
$105.58 -
SCAD Technologies Internal Tank Sensor - 10021
$102.78 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$97.18 -
Veratron Level Sensor Single Station with Seal Kit - 226-801-015-001G
$95.08 -
Veratron OceanLink Fresh Water Gauge - 52 mm (2 1/16")
$91.60 -
Vetus Connection Kit
$88.78 - $107.01 -
SCAD Technologies External Tape-On Tank Sensor - 10022
$85.98 -
Nauta Flexible Tank Fill Fitting - FTP2221
$84.58 -
Dometic Holding Tank Diptube Kit - 385310660
$80.42 -
Todd Water Tank Relocation Kit - 90-2218
$78.98 -
Maretron TFT-5H-Focus Tube Kit - TFT-5H
$76.20 -
Vetus Fuel Tank Float Sensor - FSENSOR
$73.38 -
Blue Sea Mini OLED Tank Meter
$66.38 - $67.78 -
Dometic Universal Holding Tank Cleanout Kit - 307238685
$64.98 -
Vetus Curved Extraction Pipe - WTS78038B
$62.18 -
SCAD Technologies Adapter Plate - 10029
$57.98 -
Dometic Holding Tank Flange Kit - 307230272
$56.58 -
Raritan Tank Monitor Indicator Panel Wire Harness - 152WH
$49.58 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$45.38 -
Faria Euro Black Potable Water Tank Level Gauge - 12831
$44.00 -
Scepter Potable Water Jerry Can - 5 Gal - 04933
$38.43 -
Todd Holding Tank Fitting Adapter Kit - 93-2223
$35.58 -
Todd Holding Tank Fitting Adapter Kit - 93-2220
$35.58 -
Vetus Right Angle Hose Connection
$34.18 -
Vetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$32.78 -
Nauta Flexible Tank Drawing Nipple - FTP311
$29.98 -
Todd Holding Tank Fitting Adapter Kit - 93-2222
$29.98 -
Vetus Waste Tank Repair Set - REPSETOT
$27.80 -
9% offVetus Flexible Tank Fitting
$29.98$27.04 - $29.98 -
Vetus Inspection Lid
$25.80 - $92.98
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!