Pipe Laser 7051 Manhole Transit Tower

The Butler 7051 Manhole Transit Tower is a heavy-duty, field-proven mounting system designed for sewer and storm-drain contractors who need a stable, reliable way to plumb a transit or line-transfer instrument directly over a pipe laser inside the manhole. Built by the same OEM manufacturer that produces the Topcon 56095 tower, this unit is engineered for the daily abuse of underground work — wet environments, rough concrete, uneven castings, and constant repositioning.

If your crew installs gravity-flow sewer or drainage pipe, this is the tool that keeps your line work fast, accurate, and repeatable.

What the 7051 Manhole Transit Tower Is Used For

Contractors use a manhole transit tower when they need to:

• Transfer the pipe laser’s line up to ground level

• Carry line from one manhole to the next

• Check alignment before, during, or after laying pipe

• Set hubs, pull offsets, or sight down-line above the structure

• Plumb a transit or line-transfer unit directly over the pipe laser

Any time you need a precise vertical relationship between your pipe laser at the invert and your transit at the surface, the 7051 is the tool that makes it happen. Instead of fighting improvised brackets or shaky mounts, the tower creates a stable, three-point stance that keeps your instrument locked exactly where you need it.

How It Works in the Manhole

1. Clamp the Tower to the Manhole Cone or Riser

The base anchors to the concrete or riser wall, giving you a solid, unmoving foundation inside the manhole.

2. Align the Mast Directly Over the Pipe Laser

A pivoted support arm allows the mast to swing and tilt into position. Once aligned, a steel clamping lever locks the mast solidly between the radius brackets.

3. Fine-Tune with the Acme and Balance Screws

• The large 3/4" steel acme screw provides major movement and final positioning.

• The 5/8" stainless steel balance screw with aluminum hand knob adds opposing support, giving the tower a stable three-point stance.

This setup eliminates wobble and ensures your transit stays plumb over the laser even when the surface is rough or uneven.

4. Mount Any 5/8 x 11 Instrument

The top of the mast includes a standard 5/8 x 11 thread, allowing quick mounting of transits, line-transfer units, and other compatible instruments.

Key Features & Construction

• 5/8 x 11 Instrument Mount

Accepts most transits, LTUs, and other surveying instruments.

• Heavy-Duty Cast Aluminum Cross Block

Allows both axial and radial movement, letting you position the mast at any point across the manhole opening.

• Pivoted Support with Locking Lever

Provides easy vertical alignment and locks the mast firmly in place.

• Large 3/4" Steel Acme Screw with Permanent Y-Handle

The main adjustment screw — strong, coarse-threaded, and built for tough field conditions.

• 5/8" Stainless Steel Balance Screw with Aluminum Hand Knob

Creates a stable three-point platform opposite the acme screw.

• Hardened Tool-Steel Contact Points (Replaceable)

Durable, long-lasting, and field-serviceable.

• Built for Underground Environments

Designed to withstand water, grit, rust exposure, concrete rubble, and daily handling.

When to Choose the 7051 Manhole Mount

Pick this model when you want:

• The same OEM product as Topcon’s 56095 – without compromise

• Rock-solid stability for line transfer work

• A dependable tower that stays tight inside gritty or uneven manholes

• A true contractor-grade tool built for years of sewer and storm-drain jobs

For any crew using pipe lasers, this is one of the most important accessories you can keep on your truck — because accurate line makes or breaks a pipe run.