Valterra AquaFRESH RV Water Filters: Housings, Cartridges & Inline Kits

Valterra's AquaFRESH range includes sealed inline filters, complete filter-housing systems and replacement cartridges. These products can look similar in a parts catalogue, but they are not automatically interchangeable. If you need a new filter, first identify whether your RV uses a disposable inline canister or a serviceable housing with a removable cartridge. Then match the exact part number, cartridge dimensions and filtration stage.

Which AquaFRESH part do you need?

Understand the two kinds of installation

Sealed exterior inline filter

Valterra A01-1131VP is a complete 20-micron hose-connected filter with a flexible hose protector. A01-1132VP supplies two 20-micron inline filters without that protector. These use GAC/KDF media and are replaced as complete inline filters after their service life. They are not loose inserts for a screw-off filter housing.

Serviceable single- or dual-canister filtration

The A01-1138 includes a single housing and a 5-micron carbon-block cartridge. The A01-1139 provides a dual-housing, two-stage arrangement. Its water path runs first through a 10-micron sediment pre-filter and then through a 0.5-micron carbon-block stage. Both systems are sold with their housings, mounting hardware and servicing wrench. The A01-1138BU, by contrast, is a replacement housing assembly without a manufacturer-listed cartridge.

The blocks above explain the filter sequence only; they are not an installation schematic for every RV. The single-housing A01-1138 uses one filter stage, not the full two-stage sequence.

Filter systems and product photos

A01-1131VP — Exterior inline filter with hose saver

20-micron GAC/KDF inline filtration. Includes a flexible hose protector. Valterra lists 20–100 PSI operation, 35–100°F water temperature, and up to 3,000 gallons or six months of use depending on water quality. This is not a loose cartridge for a screw-off housing.

View A01-1131VP

A01-1132VP — Exterior inline filters, two-pack

Two 20-micron GAC/KDF inline filters, without the flexible hose saver supplied in A01-1131VP. Choose this pack for a matching hose-connection application; it is not a twin replacement-cartridge set for a filter housing.

View A01-1132VP

A01-1138 — Single-housing filter system

Includes one exterior housing, one 5-micron carbon-block cartridge, mounting bracket and servicing wrench. Valterra specifies 1 GPM filtered flow. Leave space below the housing to remove its bowl when changing cartridges.

View A01-1138

A01-1139 — Two-stage dual-housing filter system

Includes two housings, cartridges, mounting bracket and wrench. The first stage is a 10-micron sediment pre-filter; the second is a 0.5-micron carbon-block filter. Manufacturer-listed flow is 2 GPM. Match each stage before buying replacements.

View A01-1139

A01-1138BU — Replacement housing and cap

Single exterior replacement canister supplied with cap and fittings. A filter cartridge is not listed as included. Confirm the existing assembly and fitting positions before replacing the housing.

View A01-1138BU

Replacement cartridges and product photos

A01-1136 — 5-micron carbon-block cartridge

One 10-inch carbon-block cartridge for a compatible exterior housing. Manufacturer-listed flow is 1 GPM; listed replacement interval is 500 gallons or six months. No complete filter housing is included.

View A01-1136

A01-1137 — 10-micron sediment pre-filters, two-pack

Two 10-inch sediment pre-filters for compatible exterior filter housings, intended to capture rust and fine sediment. Manufacturer-listed flow is 3 GPM. These are sediment pre-filters, not carbon chlorine-treatment cartridges.

View A01-1137

A01-1135 — 1-micron cyst and sediment cartridge

One 10-inch replacement cartridge intended for cyst and sediment filtration in a compatible exterior housing. It is not a complete filtration system; do not assume it has the chlorine-reduction performance of a carbon-block cartridge.

View A01-1135

Micron ratings are not complete compatibility specifications

A micron rating indicates the particle size a filter is intended to capture, but it does not establish that a cartridge will fit a given housing or provide the same chemical-treatment performance. A01-1137 is a 10-micron sediment pre-filter; A01-1136 is a 5-micron carbon block; A01-1135 is a 1-micron cyst-and-sediment cartridge. Compare the exact housing size and the cartridge's intended filtration role. Do not substitute a sediment cartridge for a carbon stage simply because it has a smaller micron number.

Choosing and maintaining your RV filter

1. Read the existing product number. Determine whether you need a disposable inline filter, an entire housing kit or only a replacement cartridge.
2. Confirm the connection method. Hose-connected inline filters differ from permanently mounted filter housings and interior threaded inline units.
3. Check cartridge dimensions and stage order. Match the existing housing, the manufacturer's cartridge requirements and the sediment-versus-carbon stage.
4. Allow room for maintenance. A screw-off housing needs clearance to remove its bowl and cartridge without stressing the plumbing.
5. Observe the service interval. Replace according to Valterra's instructions, the amount of water used and actual water quality. Avoid freezing filters and replace a damaged unit.
6. Use a safe water source. These filters are not a substitute for proper drinking-water sanitation or treatment of unsafe water. Do not assume a general RV filter makes contaminated water potable.

Related freshwater references

For incoming water pressure, see our Valterra water pressure regulator guide. For the plumbing at the RV exterior, see our flush and recessed city-water inlets. For the onboard freshwater pump, see our HydroMAX pump and strainer guide.