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NSI Industries 251-MSRT - Bridgeport Fittings Mighty-Seal« 3/4 inch EMT Connectors are used to connect a 3/4 inch EMT raceway to a box, device or enclosure. The 251MSRT 3/4 inch Mighty-Seal connector is UL listed for use in wet locations. Raintight. Patented

NSI Industries 251-MSRT Bridgeport Fittings Mighty-Seal« 3/4 inch EMT Connectors are used to connect a 3/4 inch…

UPC: 781747172518


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Contact for Pricing

Minimum Qty: 25

Multiplier: 25

*Contact for lower quantities*

Call +1 (262) 252-1600 (toll-free 877-268-3700) or email [email protected] for pricing and availability.

Overview

The NSI Industries Bridgeport Fittings Mighty-Seal™ 251-MSRT is a 3/4 inch Electrical Metallic Tubing (EMT) connector designed for rapid, tool-free installation in wet locations. This patented connector (Patent Nos. 7,841,630; 8,474,877) features a zinc die-cast construction with a ball-burnished finish, ensuring durability and corrosion resistance in industrial and outdoor environments. The 251-MSRT installs in less than half the time of conventional fittings by inserting a deburred EMT end into the connector and rotating until the conduit reaches the end stop—no additional tools required. Removal is equally straightforward: loosen the nut, disassemble, and reassemble for reuse. The connector meets NEMA FB-1 and UL514B & CSA standards, with an IP66/IP67 rating for protection against dust and water ingress. It is compatible with standard 3/4 inch EMT conduit and features an insulated throat for electrical safety. Ideal for outdoor lighting, HVAC systems, and industrial facilities, the 251-MSRT provides a secure, vibration-resistant termination that maintains electrical integrity in harsh conditions. The removable design allows for easy adjustments or maintenance without replacing the fitting. Dimensions: A = 1.47 in, B = 1.12 in, C = 0.50 in. Standard packaging: 250 units per box, 25 units per inner pack.
  • Tool-free installation and removal for 3/4" EMT conduit
  • Zinc die-cast construction with ball-burnished finish for corrosion resistance
  • IP66/IP67 rated for protection against dust and water ingress
  • Patented Mighty-Seal design ensures secure, vibration-resistant connections
  • Compatible with standard 3/4" EMT raceways; reusable design

Specifications

Application
Bridgeport Fittings Mighty-Seal® 3/4 inch EMT Connectors are used to connect a 3/4 inch EMT raceway to a box, device, or enclosure. The 251-MSRT 3/4 inch Mighty-Seal® connector is UL listed for use in wet locations.
Connection Type
Push-on
Connector Type
PUSH-EMT®
Finish
Ball burnish
Insulation
False
Ip Rating
IP66/IP67
IP Rating
IP67
Material
Steel
Material
Polymer
Material Quality
Zinc Die Cast
Series
Mighty-Seal
Size
3/4 IN
Special Features
Connectors assembled with knockout gasket, no separate pieces to buy and stock
Standard
cULus
Trade Size
3/4 in.
Type
Connector
Package Weight (Imperial)
0.168 L
Package Weight (Metric)
0.076 kg
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Frequently Asked Questions

What is the trade size of the 251-MSRT connector?

The trade size of the 251-MSRT connector is 3/4 inch.

Is the 251-MSRT connector suitable for wet locations?

Yes, the 251-MSRT connector is UL listed for use in wet locations.

What material is the 251-MSRT connector made from?

The 251-MSRT connector is made from zinc die cast.

What certifications does the 251-MSRT connector have?

The connector has certifications including UL514B and CSA 22.2.

What is the installation process for the 251-MSRT?

Installation involves inserting a properly deburred end of EMT into the Mighty-Seal® and rotating until it reaches the end stop.

How do you remove the 251-MSRT connector?

Removal is done by loosening the nut and taking out the component parts from the conduit.

What is the finish of the 251-MSRT connector?

The finish of the 251-MSRT connector is ball burnished.

What is the standard package quantity for the 251-MSRT?

The standard package quantity for the 251-MSRT is 250.

Where is the 251-MSRT connector manufactured?

The 251-MSRT connector is manufactured in the USA.

What is the UPC number for the 251-MSRT connector?

The UPC number for the 251-MSRT connector is 78174717251.

How to Install the Mighty-Seal™ Push-EMT™ Connector

This guide provides step-by-step instructions for installing the Mighty-Seal™ Push-EMT™ Connector for use in wet locations.

Estimated time: 30m

Tools needed:

Screwdriver, Reaming/deburring tool

Supplies needed:

Mighty-Seal™ Push-EMT™ Connector, Knockout gasket, Locknut

  1. Prepare the EMT

    Cut the Electrical Metallic Tubing (EMT) squarely and remove all burrs using a reaming/deburring tool to ensure a smooth outer edge.

  2. Install the connector

    Firmly push the Mighty-Seal™ Push-EMT™ Connector onto the EMT until it reaches the conduit stop, ensuring not to rotate the EMT more than a quarter turn.

  3. Secure the fitting

    Remove the serrated locknut and position the knockout gasket on the outside of the enclosure. Insert the fitting into the knockout and tighten the locknut hand-tight plus a quarter turn.

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