• 37R Rigid Rocker Lug Female to Male Adapter (ACE AA137)


The 37R adapter in 2.5” x 1.5” size is one of the most popular adapters used in the fire service to reduce a 2.5” connection to a 1.5” connection.

There are a variety of ways to utilize this adapter; such as a reducer, increaser, or to change from one type of thread to another kind.



We offer many different types of thread choices to accommodate our customers throughout the USA. We maintain a card file in our office with thread types used by various cities throughout the USA.

Our standard threads are NST (NH). They will typically ship quicker.  NSPH can be supplied for no additional charge. If your thread type is not shown below, please give us a call to discuss your requirements. 

  • National Standard Thread (NST), also known as National Hose thread (NH). It is the most common type of fire hose coupling used in the United States.
  • National Pipe Straight Hose (NPSH), also known as Iron Pipe Thread (IPT).  It has the same TPI as NPT, but the thread does not taper. NPSH is a straight thread and seals by a gasket in the female coupling which allows for a swivel.
  • Tapered Pipe Thread (NPT) Only available on the rigid side of the adapter, cannot be furnished on the swivel side.  When NPT is requested it will be furnished to ANSI B2-1968. NPT requires additional material by the Government Specifications and calls for a longer thread, therefore, causing the added thread charge.


Laser Engraving

We also offer custom laser engraving of your adapters for an additional charge. If you require this option, please select that option and type in the box the name or initials you want laser engraved. The price for laser engraving is for up to a maximum of 12 letters/numbers. The size of your adapter limits us on how many letters/numbers we can engrave. Laser engraved adapters are not subject to cancellation or return.

Color Coding

Color Coding is available, please call for pricing.


Delivery Times

Delivery times are variable by the size, and thread types you select. If you require any adapter in a rush, please give us a call, and we will be most happy to contact our factory for a lead time.


Adapter Specialists

We are adapter specialists. Our goal is to help you order the correct adapter the first time. However, many adapters are made to order. Unfortunately, they are not subject to cancelation or return once your order has been submitted. Please give us a call before ordering if you are uncertain of your thread types, sizes, or have any other questions.


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37R Rigid Rocker Lug Female to Male Adapter (ACE AA137)

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Tags: 37R Rigid Rocker Lug Female to Male Adapter, Kochek, adapters, 37R, connections, fittings, kochek