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Does “3 mm” or “4 mm” Mean Tube ID or OD?

The caliper is an inspection prop, not a measurement. This water-based option is shown for external identification; its appearance does not establish compatibility with another ink.

ID is the tube's inside diameter; OD is its outside diameter. Ask the seller to label both. A bare “4 mm” description may refer to a tube, a fitting or another measured feature, so it cannot settle the connection match by itself.

Hose-barb fittings are commonly specified by the tubing ID they accept, while push-in systems may specify tubing OD. See Cole-Parmer's fitting selection guide and SMC's one-touch fitting reference. These explain dimension conventions; they do not approve those fittings for your printer's ink.

• Use existing tubing specifications or a clean, unused matching tube sample where possible.
• If a technician measures a removed tube, record units and avoid squeezing soft material out of shape.
• Keep photographs of the inlet and outlet separate so their dimensions cannot be confused.
• Do not stretch a tube, trim a connector or force a fitting to make a near-match work.

For example, the current photo for the store's Model 4 - Water-Based option contains a “4*3mm” tube annotation. Treat that as a reason to clarify OD/ID and the current supplied connection, not as a universal size for every option on the page.

Match More Than the Printhead Name

A listing that mentions i3200 or XP600 gives you a starting reference. It does not identify every carriage, adapter, fluid route or machine revision built around that printhead family.

• Head-side connection: compare its shape, insertion depth, seal location and mating adapter.
• Mounting: check the clips, retaining arms, frame clearance and installation direction.
• Flow arrangement: identify the inlet and outlet using the machine documentation, especially with multi-port assemblies.
• Order contents: confirm whether seals, adapters or retainers are included or supplied separately.

Record the printer's complete model and printhead code, not just the brand. For a modified machine, include the current ink-system configuration and clear photos of the installed part. Do not remove a serviceable damper merely to obtain a photograph if safe access or removal requires a technician.

Do You Have a Documented Filter Rating?

A visible screen, a white body or the phrase “fine filter” does not establish a micron rating. Ask for the specification of the exact damper option being supplied, including its filter material and rating basis where available.

FUJIFILM explains that ink filtration must remove unwanted material while allowing the intended pigment through, and that filter selection must account for the ink and supply system. This supports checking the complete application rather than choosing a smaller number automatically. FUJIFILM's ink-supply filtration guidance.

• Request the original damper or machine filter specification before comparing alternatives.
• If two suppliers quote microns, ask whether their ratings use a comparable test method or efficiency definition.
• Confirm suitability for the required ink delivery conditions, including the actual ink and operating temperature.
• Keep an external inline filter's specification separate from the damper's internal filter specification.

The selected options below do not provide a complete verified filter specification in their current descriptions. This guide therefore assigns them no micron rating, flow capacity or pressure rating. If your maintenance specification requires a particular value, obtain written confirmation before purchase.

A new damper also does not automatically replace the function of an upstream filter. Follow the machine's intended ink path rather than deleting filtration stages or adding extra restrictions based on a general buying guide.

UV, Eco-Solvent and Water-Based Options Need Separate Checks

Read the selected option, not only the page title. The store's XP600 / i3200 / 4720 listing currently includes options labeled Model 3 - UV, Model 2 - Eco-Solvent and several water-based options. Those are distinct choices, not permission to exchange them across ink systems.

Send the exact ink brand, series and channel with your request. “White” is incomplete: clarify whether it means the damper body's color or a white-ink channel, then identify whether that ink is UV-curable or aqueous DTF ink.

Ink-contact materials and construction must suit the fluid. Pall's printer-filter documentation separately identifies construction materials, UV capsule options and compatibility conditions. That illustrates why appearance alone cannot establish fluid suitability; it is not a specification for the dampers sold here. Pall's on-board printer filter reference.

Compare the Delivered Part Before Introducing Ink

Reference-based scene showing external condition checks. The loupe and visible panels cannot establish filter pore size, material approval or a part-number equivalence.

1. Check the order identity. Compare the selected option, quantity and packing information with the agreed replacement. Photograph any discrepancy before installation.
2. Compare the supplied connections. Look at both ends, seals and retainers against the original-part photos. A different outlet or missing clip requires clarification.
3. Inspect the intact body. Look for shipping damage, cracks, deformation or a visibly damaged membrane. Keep the ports clean and avoid touching sealing surfaces.
4. Plan the service procedure. Have a qualified technician follow the machine's shutdown and isolation, pressure handling, replacement and priming instructions.

After installation, use the printer's prescribed checks and retain a nozzle-test baseline. Persistent dropout, leaks or returning air call for further diagnosis; they are not proof that a larger damper or finer filter is needed.