Welcome to Defender Canada! 
Water / Waste Holding Tanks
-
Plastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$233.86 -
LIST Single-Level Waste Tank Alarm - 3/4 Alert - TM-132111
$219.15 -
SCAD TM2 Tank Monitor for Two Tanks - 10041
$213.49 -
Maretron NMEA 2000 Tank Temperature Immersion Probe - TP-IP-1
$205.03 -
Thetford Tecma Field-Effect Tank Sensor
$189.47 -
Plastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$181.42 -
Raritan Tank Sensor Module Kit - 15101
$175.42 -
Dometic DVF Holding Tank Vent Filter Replacement Cartridge - 309311004
$174.06 -
Plastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$159.34 -
Raritan Tank Sensor - Float Style - STCFL
$155.68 -
Vetus No-Smell Filter with Connections
$150.04 - $190.93 -
SCAD Technologies Internal Tank Sensor - 10021
$147.22 -
Victron Energy GX Tank 140 System Monitoring - BPP920140100
$139.64 -
Veratron Level Sensor Single Station with Seal Kit - 226-801-015-001G
$133.21 -
Veratron OceanLink Fresh Water Gauge - 52 mm (2 1/16")
$127.50 -
Todd Fresh Water/Waste Water Holding Tank
$124.71 - $497.25 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$120.45 -
44% offLIST Single-Level Water Tank Alarm - 1/4 Alert - TM-131111
$202.23$111.49 -
SCAD Technologies External Tape-On Tank Sensor - 10022
$110.56 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$107.74 -
Todd Water Tank Relocation Kit - 90-2219
$106.33 -
Vetus Connection Kit
$104.92 - $126.10 -
Nauta Flexible Tank Fill Fitting - FTP2221
$92.23 -
Maretron TFT-5H-Focus Tube Kit - TFT-5H
$90.84 -
Dometic Holding Tank Diptube Kit - 385310660
$86.63 -
Vetus Fuel Tank Float Sensor - FSENSOR
$83.77 -
Todd Water Tank Relocation Kit - 90-2218
$79.54 -
Dometic Universal Holding Tank Cleanout Kit - 307238685
$75.31 -
Blue Sea Mini OLED Tank Meter
$73.90 -
Vetus Curved Extraction Pipe - WTS78038B
$72.49 -
Dometic Holding Tank Flange Kit - 307230272
$65.44 -
SCAD Technologies Adapter Plate - 10029
$54.16 -
Raritan Tank Monitor Indicator Panel Wire Harness - 152WH
$49.93 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$45.70 -
Faria Euro Black Potable Water Tank Level Gauge - 12831
$44.31 -
Scepter Potable Water Jerry Can - 5 Gal - 04933
$38.70 -
Vetus Right Angle Hose Connection
$38.65 -
Vetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$37.24 -
Todd Holding Tank Fitting Adapter Kit - 93-2223
$35.83 -
Todd Holding Tank Fitting Adapter Kit - 93-2220
$35.83 -
Vetus Flexible Tank Fitting
$34.42 -
Nauta Flexible Tank Drawing Nipple - FTP311
$33.01 -
Vetus Waste Tank Repair Set - REPSETOT
$31.60 -
Todd Holding Tank Fitting Adapter Kit - 93-2222
$30.19 -
Vetus Inspection Lid
$28.78 - $106.33 -
Perko Inlet Check Valve - 0635DP0
$26.43 -
Nauta Flexible Tank Fill Fitting - FTP1210
$25.27 -
Nauta Flexible Tank Drawing Nipple - FTP400
$22.71
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!