Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Sea-Dog Gas Tank Strap - 359995-1
$16.80 -
Nauta Flexible Tank Drawing Nipple - FTP300
$18.24 -
Nauta Flexible Tank Drawing Nipple - FTP1300
$21.00 -
Nauta Flexible Tank Vent Fitting - FTPE300
$21.35 -
Nauta Flexible Tank Drawing Nipple - FTP400
$22.71 -
Nauta Flexible Tank Fill Fitting - FTP1210
$25.27 -
Perko Inlet Check Valve - 0635DP0
$25.88 -
Vetus Inspection Lid
$28.18 - $90.82 -
Todd Holding Tank Fitting Adapter Kit - 93-2222
$30.19 -
Vetus Waste Tank Repair Set - REPSETOT
$30.94 -
Nauta Flexible Tank Drawing Nipple - FTP311
$33.01 -
Vetus Flexible Tank Fitting
$33.70 -
Todd Holding Tank Fitting Adapter Kit - 93-2223
$35.83 -
Todd Holding Tank Fitting Adapter Kit - 93-2220
$35.83 -
Vetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$36.46 -
Vetus Right Angle Hose Connection
$37.84 -
Scepter Potable Water Jerry Can - 5 Gal - 04933
$38.70 -
Faria Euro Black Potable Water Tank Level Gauge - 12831
$44.31 -
Todd Holding Tank Fitting Adapter Kit - 93-2221
$45.70 -
Raritan Tank Monitor Indicator Panel Wire Harness - 152WH
$49.93 -
SCAD Technologies Adapter Plate - 10029
$54.16 -
Dometic Holding Tank Flange Kit - 307230272
$65.44 -
Vetus Curved Extraction Pipe - WTS78038B
$70.96 -
Blue Sea Mini OLED Tank Meter
$73.90 -
Dometic Universal Holding Tank Cleanout Kit - 307238685
$75.31 -
Todd Water Tank Relocation Kit - 90-2218
$79.54 -
Vetus Fuel Tank Float Sensor - FSENSOR
$82.00 -
Dometic Holding Tank Diptube Kit - 385310660
$86.63 -
Maretron TFT-5H-Focus Tube Kit - TFT-5H
$90.84 -
Nauta Flexible Tank Fill Fitting - FTP2221
$92.23 -
Vetus Connection Kit
$102.70 - $123.43 -
Todd Water Tank Relocation Kit - 90-2219
$106.33 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$107.74 -
SCAD Technologies External Tape-On Tank Sensor - 10022
$110.56 -
44% offLIST Single-Level Water Tank Alarm - 1/4 Alert - TM-131111
$202.23$111.49 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$120.45 -
Todd Fresh Water/Waste Water Holding Tank
$124.71 - $497.25 -
Veratron OceanLink Fresh Water Gauge - 52 mm (2 1/16")
$127.50 -
Veratron Level Sensor Single Station with Seal Kit - 226-801-015-001G
$133.21 -
Victron Energy GX Tank 140 System Monitoring - BPP920140100
$139.64 -
Vetus No-Smell Filter with Connections
$146.86 - $186.88 -
SCAD Technologies Internal Tank Sensor - 10021
$147.22 -
66% offOceanic Systems Deck-Mounted Water Gauge - 5250-W
$458.83$152.17 -
Raritan Tank Sensor - Float Style - STCFL
$155.68 -
Dometic DVF Holding Tank Vent Filter Replacement Cartridge - 309311004
$174.06 -
Raritan Tank Sensor Module Kit - 15101
$175.42 -
Plastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$185.35 -
Thetford Tecma Field-Effect Tank Sensor
$189.47
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!