Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Todd Fresh Water/Waste Water Holding Tank
$130.83 - $525.93 -
Dometic DVF Holding Tank Vent Filter Replacement Cartridge - 309311004
$150.38 -
SCAD TM1 Tank Monitor with External Sensor Strip - 10040
$262.38 -
Plastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$203.61 -
Vetus Flexible Fresh Water Tank
$270.83 - $510.23 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$213.38 -
Plastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$220.42 -
Vetus Flexible Waste Water Holding Tank
$378.63 - $748.23 -
SCAD Technologies External Tape-On Tank Sensor - 10022
$85.98 -
Nauta Heavy Duty Diesel Fuel and Waste Tank - 14.5 Gal - FT915122
$770.62 -
Plastimo Rectangular Flexible Water Tank - 52.8 Gal - 70956
$303.03 -
Maretron NMEA 2000 Tank Level Monitor - TLM100-01
$315.58 -
Plastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$160.20 -
Nauta Flexible Fresh Water Tank
$503.22 - $853.23 -
Dometic 20 HTS-VRT Basic Series Waste Water Holding Tank System - 18 Gal - 322840202
$766.65 -
Dometic Multi-Level Tank Monitor System
$475.18 -
Veratron VDO Fresh Water Level Sender - 226-828-001-001K
$539.86 -
Vetus Universal Synthetic Tank
$234.70 - $1,220.34 -
Dometic DTM01 Holding Tank Monitor - 313002311
$220.38 -
Dometic DTM04 TankWatch 4-Level Tank Monitor System
$503.22 -
SCAD Technologies Internal Tank Sensor - 10021
$102.78 -
Dometic 25 HTS-HRZ Basic Series Waste Water Holding Tank System - 25 Gal - 322800251
$692.44 -
Nauta Flexible Tank Fill Fitting - FTP2221
$84.58 -
Scepter Potable Water Jerry Can - 5 Gal - 04933
$38.43 -
LIST 3-Level Waste Tank Monitor - TM-332111
$332.40 -
9% offVetus Flexible Tank Fitting
$29.98$27.04 - $29.98 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$97.18 -
Vetus Inspection Lid
$25.80 - $92.98 -
Vetus No-Smell Filter with Connections
$119.58 - $168.58 -
Raritan Holding Tank Monitor - 1510012
$708.98 -
Groco Tank Level Sensor - 08-0004-02
$340.78 -
Vetus Fuel Connection Kit Filler
$289.00 - $317.02 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$45.38 -
Todd Water Tank Relocation Kit - 90-2219
$105.58 -
Dometic Universal Holding Tank Cleanout Kit - 307238685
$64.98 -
Maretron TFT-5H-Focus Tube Kit - TFT-5H
$76.20 -
Groco 4-Way Tank Selector Kit - TS-350-T
$249.80 -
Groco SweetTank Odor Neutralization System
$508.80 - $517.20 -
Blue Sea Systems M2 OLED Digital Tank Monitor - 1839
$386.98 -
Vetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$32.78 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$107.00 -
Vetus Universal Tank Float Sensor
$218.98 - $322.58 -
Nauta Flexible Tank Drawing Nipple - FTP311
$29.98 -
SCAD Technologies Adapter Plate - 10029
$57.98 -
Maretron Tank Level NMEA 2000 Adapter - TLA100-01
$368.78 -
Veratron Fresh Water Level Sensor with Sealing Kit #370
$226.12 - $555.00 -
Victron Energy GX Tank 140 System Monitoring - BPP920140100
$138.66 -
Vetus Ultrasonic Fluid Level Sensor
$246.98 - $258.18
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!