Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Todd Water Tank Relocation Kit - 90-2218
$76.18 -
Todd Water Tank Relocation Kit - 90-2219
$101.83 -
Scepter Potable Water Jerry Can - 5 Gal - 04933
$37.09 -
SCAD Technologies External Tape-On Tank Sensor - 10022
$82.93 -
SCAD Technologies Internal Tank Sensor - 10021
$99.13 -
SCAD TM1 Tank Monitor with External Sensor Strip - 10040
$253.03 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$205.78 -
SCAD Technologies Adapter Plate - 10029
$55.93 -
Raritan Tank Sensor - Float Style - STCFL
$145.03 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$93.73 -
63% offOceanic Systems 4-20mA Tank Level Adaptor - 4291
$365.08$132.30 -
56% offOceanic Systems Deck-Mounted Water Gauge - 5250-W
$439.33$189.60 -
Nauta Flexible Tank Drawing Nipple - FTP1300
$17.05 -
Nauta Flexible Tank Drawing Nipple - FTP311
$31.63 -
Nauta Flexible Tank Drawing Nipple - FTP300
$17.49 -
Nauta Flexible Tank Drawing Nipple - FTP400
$21.77 -
Nauta Flexible Tank Fill Fitting - FTP2221
$88.33 -
Nauta Flexible Tank Fill Fitting - FTP1210
$24.22 -
Nauta Flexible Tank Vent Fitting - FTPE300
$20.47 -
14% offNauta Heavy Duty Diesel Fuel and Waste Tank - 14.5 Gal - FT915122
$743.12$631.75 -
Maretron NMEA 2000 Tank Level Monitor - TLM100-01
$331.33 -
Maretron NMEA 2000 Tank Temperature Immersion Probe - TP-IP-1
$196.33 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$115.35 -
Maretron Tank Level NMEA 2000 Adapter - TLA100-01
$371.83 -
Maretron Tank Level Sender - TLM150-01
$371.83 -
Maretron TFT-5H-Focus Tube Kit - TFT-5H
$81.60 -
LIST 3-Level Waste Tank Monitor - TM-332111
$323.25 -
LIST 3-Level Water Tank Monitor - TM-331111
$323.25 -
LIST Single-Level Waste Tank Alarm - 3/4 Alert - TM-132111
$209.85 -
39% offLIST Single-Level Water Tank Alarm - 1/4 Alert - TM-131111
$193.65$116.43 -
Groco SweetTank Odor Neutralization System
$492.00 - $506.85 -
Groco Tank Level Sensor - 08-0004-02
$335.38 -
Groco Tank Level Sensor Assembly - 450 ASSY
$437.98 -
Dometic Universal Holding Tank Cleanout Kit - 307238685
$68.08 -
Dometic 10 HTS-T Waste Water Holding Tank System with Pump - 10 Gal - 322721012
$1,564.17 -
Dometic 12 HTS-HRZ Basic Series Waste Water Holding Tank System - 11 Gal - 322840121
$698.68 -
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 15 HTS-VRT Basic Series Waste Water Holding Tank System - 15 Gal - 322840152
$886.42 -
Dometic 20 HTS-HRZ Basic Series Waste Water Holding Tank System - 18 Gal - 322840201
$768.89 -
Dometic 20 HTS-VRT Basic Series Waste Water Holding Tank System - 18 Gal - 322840202
$782.50 -
Dometic 25 HTS-HRZ Basic Series Waste Water Holding Tank System - 25 Gal - 322800251
$705.54 -
Dometic 28 HTS-T Waste Water Holding Tank System with Pump - 28 Gal - 322012812
$2,020.44 -
Dometic 30 HTS-HRZ Basic Series Waste Water Holding Tank System - 28 Gal - 322840301
$810.85 -
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 -
Dometic 55 HTS-HRZ Basic Series Waste Water Holding Tank System - 55 Gal - 322840551
$968.89 -
Dometic DTM01 Holding Tank Monitor - 313002311
$221.98
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!