Verified 28 July 2026

Metal-body sight flow indicators manufacturers in Germany

Below are manufacturers that produce metal-body sight flow indicators and related sight-glass windows; buyers looking for these products should check body material, window type and approvals, connection size/pattern, and compatibility with their process media. Focus here is on suppliers and makers with verifiable product pages; country is given when the evidence shows it.

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7 verified manufacturers

  • PKPGermany

    “PKP product page: "Flow indicator with and without rotor, with wipers for cleaning of sight glass to monitor the flow of liquids..." (pkp.de product page for sight-flow indicators).”

  • METAGLAS®Germany

    “METAGLAS® product page: "METAGLAS® Window for Sight Flow Indicator (DIN) Metal fused sight glasses. METAGLAS® Window for Sight Flow Indicator (DIN) Factory Approval FM-Approval."”

  • KoboldGermany

    “Kobold product page: "DA - All-Metal Sight Flow Indicators - Flap, Rotor, or Drip Indication. German precision engineering paired with quality US manufacturing since 1980."”

  • Bliss EuropeEurope

    “Bliss Europe product page: "Bliss Europe designs and manufactures industrial screwed-type sight flow indicators for mechanical flow visibility in critical process environments."”

  • L.J. Star IncorporatedUSA

    “L.J. Star product/handbook pages: "With LJ Star Incorporated, you can be assured of high-quality industry-proven sight flow indicators..." and sight flow indicators handbook PDF on ljstar.com.”

  • Kadant Fluid HandlingUSA

    “Kadant product page: "Bodies are manufactured from durable ductile iron and range in sizes from 3/8" to 4" with threaded and flanged options." (sight-flow indicators page).”

  • OPWUSA

    “OPW product page: "VISI-FLO® 1400 Series Sight Flow Indicators are designed for operating pressures up to 200 PSIG..." (opwglobal.com sight flow indicators).”

Compiled from public sources and refreshed periodically. Always verify certifications and capabilities directly with the manufacturer before ordering.

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What to specify in your RFQ

Manufacturers quote faster and more accurately when your request covers these points.

  • Body material

    Specify metal type (carbon steel, ductile iron, bronze, 304/316 stainless) because pressure, corrosion resistance and temperature rating depend on it.

  • Window type and material

    Specify fused metal-glass, tempered glass, or specialty sight glass and any approvals (e.g. DIN, FM) required for your application.

  • Connection size and pattern

    Provide threaded size (NPT, BSP), flange type and dimensions, or special fittings to match your piping.

  • Operating pressure and temperature

    Give maximum working pressure and temperature range so the manufacturer can select appropriate seals, body rating and window construction.

  • Fluid type and viscosity

    State the media (water, oil, chemicals) and viscosity so suppliers can recommend rotor/impeller type and internal clearances or wipers.

  • Quantity and delivery requirement

    State unit quantity and desired lead time; small manufacturers may have minimum production batches that affect price and schedule.

  • Certifications and standards

    List any required certifications (DIN, FM, PED, ATEX, NSF) or testing/inspection documentation you need with the parts.

Sourcing FAQ

How do I verify a supplier actually manufactures metal-body sight flow indicators?
Ask for the manufacturer's product page, data sheets, or handbook that show model numbers and technical specs; factory photos or references to in-house standards (e.g. "we manufacture" product pages) are helpful evidence.
What drives lead time for these indicators?
Lead time is typically affected by material selection (stainless or specialty metals), custom window/approval requirements, and whether parts are standard stock or require machining and assembly in the factory.
Are there typical minimum order quantities (MOQs)?
MOQs vary by manufacturer and by whether you order standard catalog items versus custom-configured or certified units; always request MOQ upfront when evaluating quotes.
Which certifications should I ask for?
Request relevant standards and approvals for your industry and region — common examples include DIN/EN conformance, PED/CE for pressure equipment, FM approval, and material traceability certificates for high-risk services.

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