Genuine 3M™ Under Sink Caravan and RV Water Filter System


Point of Use Genuine 3M™ Cuno™ Under Sink Caravan and RV Water Filter System for sediment, chemical, scale, bad taste/odour reduction.


3M™ Cuno™ Under Sink Caravan and RV Water Filter System. 

Comes with a high-quality American-made HC351-s filter, VH3/NEP filter head and your choice of two dedicated drinking water taps.

A complete filtration solution which safeguards the quality of your water while you are travelling in your caravan or RV. Ideal for treating harsh Australian water.

Removes a huge range of contaminants including sediment, rust, dirt, chlorine, chloramines, pesticides, herbicides, volatile organic compounds and much more.

Built-in scale protection which makes it ideal for travellers who are visiting areas with hard water, like South Australia, Western Australia, Queensland, and Northern Territory.

Also offers protection from parasitic cysts like Cryptosporidium, Cyclospora, and Giardia, which may be present in untreated water from tanks, bores, and natural water sources.

This system is designed for use with a dedicated drinking water tap.
We have some options to choose from, or if you already have your own dedicated filtered water tap we have the ‘no tap’ option.

If you would prefer a high-flow water filtration solution for under your sink, take a look at the BESTWF or BESTHC with 12mm fittings. For a slimline inline under sink option, take a look at the Complete Under Sink Caravan Or RV Water Filter Kit.

Features and Benefits

  • Dramatically Improves The Taste/Odour of Your Water
    Both of the filters available with this system use high-quality activated coconut carbon. It eliminate any bad flavours or odours in your water, which is handy when travelling around Australia and being forced to used smelly or bad tasting water.
  • Genuine 3M™ Product
    Because it is a genuine 3M™ product you know it is manufactured according to the highest of standards by a company you can trust.
  • Sanitary Quick Change System
    Because the filter is fully self enclosed, you will never touch the surface of the filter, making it extremely sanitary. The innovative quick change system means that swapping filters is as easy as changing a light bulb. Simply twist the filter and pull it down. The head will automatically cut off the water supply as soon as you undo the filter.
  • Consistent Quality Water
    One of the best reasons to use 3M™ filtration products is that they are consistent and reliable for the removal of contaminants including sediment, chlorine, bad taste/odour and TDS.
  • High Chlorine Reduction Capacity
    The HC351-S has a large chlorine reduction capacity of 13,249 litres.

What Contaminants Does It Reduce?

This unit can reduce a wide range of contaminants including:

  • Chlorine and chloramines
  • Sediment including sand, silt, rust, dirt, algae, and insoluble metal particles
  • Disinfection by-products including Trihalomethanes
  • Pesticides and Herbicides
  • Pharmaceutical compounds
  • Volatile organic compounds (VOC)
  • Polychlorinated biphenyls and more

The 3M™ HC351-s also contains polyphosphate, which will also reduce scale build-up from hard water.


  • Chlorine reduction capacity: 13,249 litres or 12 months (approximately)
  • Dimensions: 265mm x 85mm
  • Max pressure: 862 kPa
  • Connection type: 3/8″ Tube Fittings in Filter Head with 1/4″ Tube Fittings Also Supplied

Other fittings sizes available on request.

Filtration Process

The 3MHC351-S is a three stage filter with the following filtration process:

Stage 1: Sediment filtration

After water enters the filter, particulate matter is reduced using a fine 1 micron sediment pad. It will reduce all types of solid particulate matter including rust, sand, silt, dirt, algae, and much more.

Stage 2: Activated Carbon 

Next, the water flows through a solid carbon block. As the water pushes through, chemical contaminants will adhere to the pores of the carbon. It dramatically reduces a wide range of chemical contaminants including chlorine, chloramines, volatile organic compounds, petrochemicals, pharmaceuticals and much more.

The carbon also reduces any unpleasant odours or flavours in your water, making it much more palatable and enjoyable to drink.

Stage 3: Polyphosphate 

In the final stage, the water runs through food-grade polyphosphate granules. If the water is hard, the polyphosphate will begin to dissolve, coating dissolved calcium and magnesium ions so they cannot form scale as easily on your sinks and taps. A great way to avoid unsightly scale build-up and protect your caravan from damage.

Also available with the CWFAP9300 after market 1 micron filter in the product options.

What’s In The Box?

Our affordable inline caravan and RV filter system comes with everything you need to filter your incoming water, including:

  • 1 x 3M HC-351-s (with VH3/NEP Head)
  • 1 x 290/BL Black Lever chrome tap OR 301/C Chrome tap
  • 1 x 7/16″ UNS to 1/4″ Connector (Connects your tap to tubing)
  • 2 x Metres of 1/4″ blue tubing (Runs between water filter and tap)
  • 1 x 12mm DMFit Tee fitting (Connects with your standard 12mm tubing)
  • 1 x 12mm stem to 1/2″ BSP male  (Connects with Tee fitting)
  • 1 x 1/2″ BSP female to 1/4″ tube  (Connects with Stem fitting to feed water filter)
  • 2 x 3/8″ Stem to 1/4″ Tube Fittings (Inserts into filter head and connects to 1/4″ tubing)

Operation Tips

Instructions are included with the system to make installation a breeze. All you will need to do is cut into the 12 mm cold water line which feeds your existing tap, insert the tee piece, then install the filter. Find a great location for your tap then run 1/4″ tubing into the outlet of the filter.

Delivery Details

Deliveries will be shipped out same-day via Australia Post, Aramex or Startrack.

Cut off times are 1 pm for Aramex and Startrack deliveries, and 4 pm for Australia Post deliveries.

Frequently Asked Questions

Are Replacement Filters Easy To Find?

3M is one of the world’s largest sellers of water filter systems and water filter replacement cartridges. You can find 3M cartridges in many hardware stores, plumber supplies stores, and water filter retailers across Australia.  This means you’ll never struggle to find replacement filters.


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