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Family of Flatliner Line Markers by Maloney

Maloney Flatliner Line Marker

Durable & Flexible Fiberglass Utility Marker for Two-Sided View

The purpose of the Maloney Flatliner Line Marker is to indicate the location of a buried line (pipeline, cable, conduit, etc.) and to identify its owner. This helps construction crews to avoid accidentally damaging the buried lines. It also serves as a warning to the general public that there is a buried line in the area.The Flatliner Line Marker is an economical marker designed for applications where low profile identification is preferred. It is easy to install taking less than 1 minute using standard industry tools.The Maloney Flatliner is made of ultraviolet stabilized fiberglass composite. It will not fade, warp, absorb water, or otherwise deteriorate from prolonged exposure to the elements. They are available in a variety of colors and sizes.


The Maloney Flatliner Linemarker is available with or without decals. Decals are constructed with premium vinyl film to withstand constant outside exposure.

Generic decals with your company name and phone number can be added or custom decals can be supplied to your specifications. Standard decals are 3″ by 15″ in size. Custom sizes available.

All decals are applied to the Flatliners before shipping unless otherwise specified.

Flatliner Line Marker

View Our Full Range of Line Markers and Test Stations

As a dedicated manufacturer of line marker products, we offer customized line markers and test stations to meet your specific requirements.

Zoomed View of Maloney LineMRKR


Zero-Maintenance, Pipeline-Tough Line Markers

QuickSnap Line Marker

QuickSnap Line Marker

Maloney QuickSnap® Line Marker Heads show we have our heads in the right place.

Maloney Test Stations and Vent Heads

Test stations/Vent Heads

Zero-Maintenance, Pipeline-Tough Test Stations

Maloney Phantom Splice / Test Station

Phantom Splice/Test Station

The Beauty of the new Maloney V3 Phantom Splice/Test Station is that nobody (except you) will notice it.

Maloney Flatliner Line Marker

Flatliner Line Marker

Durable & Flexible Fiberglass Utility Marker for Two-Sided View

Product Nominal O.D. Length
    1. Fitting 3-3/4″ 18″
    2. Support Post 3-1/2 72″
B. Test Station/LineMRKR Combination
    1. Test Station Fitting 3-3/4″ 18″
    2. Support Post 3-1/2 72″
C. Vent Pipes
   1. Vent Fitting 4″ 20-1/4″
   2. Support Post 3-1/2″ 72″
   3. Sleeve 3-3/4″ 15″
D. Anchor Tube 7/8″ 9″

* Support posts can be supplied in custom lengths, length shown is standard.

Components are mechanically riveted with stainless steel rivets. Maloney LineMRKRS are supplied to meet DOT standards. Line Markers 195.410 and Line Markers for Mains and Transmission Lines 192.707.

line marker and test stations diagram