Welcome to Defender Canada! 
Water / Waste Holding Tanks
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Nauta Flexible Tank Drawing Nipple - FTP300
$17.56 -
Nauta Flexible Tank Drawing Nipple - FTP1300
$18.40 -
Nauta Flexible Tank Vent Fitting - FTPE300
$20.53 -
Nauta Flexible Tank Drawing Nipple - FTP400
$21.86 -
9% offPerko Inlet Check Valve - 0635DP0
$25.81$23.29 -
9% offVetus Inspection Lid
$26.88 - $96.94$24.25 - $87.31 -
Nauta Flexible Tank Fill Fitting - FTP1210
$24.29 -
14% offVetus Waste Tank Repair Set - REPSETOT
$28.97$24.72 -
9% offVetus Flexible Tank Fitting
$31.24$28.18 -
9% offTodd Holding Tank Fitting Adapter Kit - 93-2222
$31.24$28.18 -
Nauta Flexible Tank Drawing Nipple - FTP311
$31.24 -
14% offVetus Right Angle Hose Connection
$38.54$32.85 -
9% offTodd Holding Tank Fitting Adapter Kit - 93-2220
$37.08$33.43 -
9% offVetus Spare Filter Element for No-Smell Filter - Large - NSF16FE
$38.54$34.75 -
9% offScepter Potable Water Jerry Can - 5 Gal - 04933
$40.05$36.11 -
Todd Holding Tank Fitting Adapter Kit - 93-2223
$37.08 -
9% offFaria Euro Black Potable Water Tank Level Gauge - 12831
$45.86$41.33 -
9% offTodd Holding Tank Fitting Adapter Kit - 93-2221
$47.30$42.63 -
9% offRaritan Tank Monitor Indicator Panel Wire Harness - 152WH
$51.68$46.57 -
9% offDometic Holding Tank Flange Kit - 307230272
$58.98$53.14 -
9% offSCAD Technologies Adapter Plate - 10029
$60.44$54.46 -
14% offVetus Curved Extraction Pipe - WTS78038B
$70.66$60.15 -
9% offDometic Universal Holding Tank Cleanout Kit - 307238685
$67.74$61.03 -
9% off
Blue Sea Mini OLED Tank Meter
$69.20 - $70.66$62.34 - $63.66 -
14% offVetus Fuel Tank Float Sensor - FSENSOR
$76.50$65.12 -
Maretron TFT-5H-Focus Tube Kit - TFT-5H
$72.73 -
9% offTodd Water Tank Relocation Kit - 90-2218
$82.34$74.17 -
9% offDometic Holding Tank Diptube Kit - 385310660
$83.84$75.52 -
9% offSCAD Technologies External Tape-On Tank Sensor - 10022
$89.64$80.74 -
14% offVetus Connection Kit
$101.32 - $121.79$86.21 - $103.61 -
Nauta Flexible Tank Fill Fitting - FTP2221
$88.18 -
Veratron OceanLink Fresh Water Gauge - 52 mm (2 1/16")
$93.89 -
Raritan Tank Sensor - Stick-On Style - STCTSA
$96.29 -
9% offSCAD Technologies Internal Tank Sensor - 10021
$107.16$96.51 -
Veratron Level Sensor Single Station with Seal Kit - 226-801-015-001G
$99.13 -
9% offTodd Water Tank Relocation Kit - 90-2219
$110.08$99.13 -
14% offPlastimo Square Flexible Fresh Water Tank - 13.2 Gal - 70963
$117.40$99.88 -
Maretron SAE 5-Bolt Pattern Focus Tube - TFTDBE-5H
$100.47 -
9% offTodd Fresh Water/Waste Water Holding Tank
$136.41 - $428.61$122.84 - $385.83 -
34% offLIST Single-Level Water Tank Alarm - 1/4 Alert - TM-131111
$209.38$136.30 -
14% offPlastimo Rectangular Flexible Water Tank - 26.4 Gal - 70965
$161.21$137.12 -
9% offRaritan Tank Sensor - Float Style - STCFL
$156.80$141.18 -
Victron Energy GX Tank 140 System Monitoring - BPP920140100
$144.57 -
9% offDometic DVF Holding Tank Vent Filter Replacement Cartridge - 309311004
$165.56$149.07 -
14% offPlastimo Triangular Flexible Water Tank - 31.7 Gal - 70957
$186.04$158.23 -
9% offRaritan Tank Sensor Module Kit - 15101
$181.62$163.52 -
Maretron NMEA 2000 Tank Temperature Immersion Probe - TP-IP-1
$168.41 -
19% offLIST Single-Level Waste Tank Alarm - 3/4 Alert - TM-132111
$223.98$179.30
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!