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Water / Waste Holding Tanks

Flexible Water & Holding Tanks Tank Accessories Rigid Water & Holding Tanks Tank Monitors

99 Listed

  1. Todd Holding Tank Fitting Adapter Kit - 93-2220

    $35.83
    0

  2. SCAD Technologies External Tape-On Tank Sensor - 10022

    $110.56
    2

  3. Groco SweetTank Odor Neutralization System

    $513.84 - $525.12
    0

  4. Veratron Fresh Water Level Sensor with Sealing Kit #370

    $317.21 - $778.76
    0

  5. Nauta Flexible Tank Vent Fitting - FTPE300

    $21.35
    0

  6. Perko Inlet Check Valve - 0635DP0

    $26.43
    1

  7. Victron Energy GX Tank 140 System Monitoring - BPP920140100

    $139.64
    1

  8. Todd Holding Tank Fitting Adapter Kit - 93-2223

    $35.83
    0

  9. Raritan Tank Sensor - Float Style - STCFL

    $155.68
    0
  10. 9% off

    Maretron Tank Level Sender - TLM150-01

    $415.12
    $373.67
    1

  11. SCAD Technologies Adapter Plate - 10029

    $54.16
    0

  12. Nauta Flexible Tank Drawing Nipple - FTP400

    $22.71
    0

  13. Nauta Flexible Tank Fill Fitting - FTP1210

    $25.27
    1

  14. LIST 3-Level Water Tank Monitor - TM-331111

    $337.59
    0

  15. Todd Water Tank Relocation Kit - 90-2218

    $79.54
    1

  16. Nauta Flexible Tank Drawing Nipple - FTP1300

    $21.00
    0

  17. LIST Single-Level Waste Tank Alarm - 3/4 Alert - TM-132111

    $219.15
    0

  18. Raritan Holding Tank Monitor Indicator Panel - 1520012

    $382.69

  19. Vetus Fuel Tank Float Sensor - FSENSOR

    $83.77

  20. Vetus Connection Kit

    $104.92 - $126.10

  21. Sea-Dog Gas Tank Strap - 359995-1

    $16.80

  22. Veratron Waste Water Level Sensor with Sealing Kit #930

    $506.42 - $967.98
    0

  23. Veratron OceanLink Fresh Water Gauge - 52 mm (2 1/16")

    $127.50
    0

  24. Todd Holding Tank Fitting Adapter Kit - 93-2222

    $30.19
    0

  25. Vetus Waste Tank Repair Set - REPSETOT

    $31.60
    0

  26. Nauta Flexible Tank Drawing Nipple - FTP300

    $18.24
    0

  27. Dometic 12 HTS-HRZ Basic Series Waste Water Holding Tank System - 11 Gal - 322840121

    $773.41
    0

  28. Dometic 15 HTS-VRT Basic Series Waste Water Holding Tank System - 15 Gal - 322840152

    $979.36
    0

  29. Dometic 20 HTS-VRT Basic Series Waste Water Holding Tank System - 18 Gal - 322840202

    $863.77
    0

  30. Dometic 30 HTS-HRZ Basic Series Waste Water Holding Tank System - 28 Gal - 322840301

    $894.79
    0

  31. Dometic Holding Tank Diptube Kit - 385310660

    $86.63
    0

  32. Vetus Fuel Connection Kit Filler

    $386.94 - $458.87

  33. Thetford Tecma Field-Effect Tank Sensor

    $189.47

  34. Veratron Fresh Water Level Sensor with Sealing Kit #930

    $317.21 - $766.23
    0

  35. Victron Energy VE.Can Resistive Tank Sender Adapter - BPP900600100

    $468.03
    0

  36. Groco Full Color Touchscreen LCD Monitor - 5" - LCD-5

    $2,279.16

  37. Faria Euro Black Potable Water Tank Level Gauge - 12831

    $44.31
  38. 39% off

    LIST Single-Level Water Tank Alarm - 1/4 Alert - TM-131111

    $202.23
    $121.57
    0

  39. Dometic 10 HTS-T Waste Water Holding Tank System with Pump - 10 Gal - 322721012

    $1,730.94
    0

  40. Dometic 12 HTS-VRT Basic Series Waste Water Holding Tank System - 11 Gal - 322840122

    $769.16
    0

  41. Dometic 15 HTS-HRZ Basic Series Waste Water Holding Tank System - 15 Gal - 322840151

    $977.95
    0

  42. Dometic 20 HTS-HRZ Basic Series Waste Water Holding Tank System - 18 Gal - 322840201

    $849.55
    0

  43. Dometic 28 HTS-T Waste Water Holding Tank System with Pump - 28 Gal - 322012812

    $2,224.41
    0

  44. Dometic 40 HTS-HRZ Basic Series Waste Water Holding Tank System - 34 Gal - 322840401

    $1,001.95
    0

  45. Dometic 40 HTS-T Waste Water Holding Tank System with Pump - 40 Gal - 322014012

    $2,320.38
    0

  46. Dometic 55 HTS-HRZ Basic Series Waste Water Holding Tank System - 55 Gal - 322840551

    $1,073.95
    0

  47. Groco Tank Level Sensor Assembly - 450 ASSY

    $451.78
    0

  48. Raritan TankAssure Sensor Kit - 15610

    $551.91
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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!

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