MLM4 Monstro-Couplers 4.05 OD 3.5 Pipe

Light Source

36 in stock

Light Source

$173.75 $146.22
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MLM4 Monstro-Couplers 4.05 OD 3.5 Pipe

ALL BULBS will beat "ALL" competitors pricing! ….... Call 516.766.2266

MLM4 Mega-Coupler 4.05 inch OD  3.5 Pipe  Light Source

The Monstro-Couplers are designed to fit pipes larger than the standard theatrical battens. CNC machined from solid billet aircraft-grade aluminum, they are perfect for attaching to odd size pipes and tubes. Monstro-Couplers have a narrow size range of application. Monstro-Couplers are designed with a plus or minus 0.0625" tolerance on their nominal size to ensure that they will fit with the Aluminum Association pipe and tubing manufacturing tolerances. One size does NOT fit all! See sizes listed below. Custom sizes are available upon request.

Different size Monstro-Couplers can be attached together to make a swiveling connection. The product MLSM3TO2 defines a swivel Monstro-Coupler for fastening a 3" tube to 2" tube. Swivel couplers can also be made with two couplers of the same size.

Stainless steel hardware is available as a custom option. Add “-SS” to the part number for 304 SS, a less expensive stainless steel which is fine for most inland outdoor usage.
Add “-316SS” to the part number for 316 stainless steel which provides corrosion protection in marine usage. 316 stainless steel is expensive but worth the extra cost for salt water environments, fountains, and swimming pools.

A black anodized finish is also available as a custom option.

Download Spec Sheet (PDF)
Minimum Size

2.0" Pipe, 2.5" OD tube (for MLM2.5)

Maximum Size

Most any size

Safe Vertical Working Load

1100 lbs.


Standard Hardware -
1-1/4" Gr 8 zinc plated steel bolt.
1" OD Belleville spring washer and nylock nut.


1" thick, 1" wide


MLM2.5 = 1.2 pounds

Case Quantities


Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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