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Amarillo Fast-Grip Gaskets

AMERICAN’s Amarillo Fast-Grip gaskets have proven to be a superior field-adaptable method of restraining 4"-30" ductile iron pipe used in underground service for water, sewage or other approved liquids.

The restraint provided by the patented1 Amarillo AMERICAN Fast-Grip gasket is due to the development of wedging action between pairs of high-strength stainless steel elements spaced around the gasket. The outer metal element, which has sharp teeth on its inner surface for gripping the spigot, acts as a bearing member for the wedge-shaped inner element.

Because of this wedging design, the force between the spigot and the socket of the joint is essentially constant at any given pressure thrust regardless of the “tightness” or “looseness” of the joint fit or the joint deflection.

The Amarillo Fast-Grip gasket, which has the same basic shape as AMERICAN’s Fastite gasket, can be used in any 4"-30" standard Fastite pipe socket. It is UL Listed and FM Approved for use in Fastite or Flex-Ring sockets with Fastite plain ends2 in all sizes 4"-16". The UL listing and FM approval apply to all 4” through 16” diameters and all pressure classes and special thickness classes in that size range.

In addition to the positive restraint achieved, Fast-Grip gaskets offer ergonomically friendly advantages compared to other restrained joints for fittings and pipe requiring bolts, lugs, segments, wrenches, etc. Joints can easily be assembled with current tools and methods used for many years in the assembly of standard Fastite joints.

1.) U.S. Patent No. 5,067,751.

2.) Because the pressure rating of the joint cannot exceed that of the pipe, the 350 psi rating for 14"-18" sizes and the 250 psi rating for 24" size are limited by the pressure class of pipe with which they are used. For example, an 18" Fast-Grip gasket used with pressure class 250 pipe would carry a rating of 250 psi instead of 350 psi. Consult AMERICAN for higher working pressure applications.

3.) When installing joints manufactured by AMERICAN Cast Iron Pipe Company, the use of gaskets not manufactured by AMERICAN or an authorized manufacturer of AMERICAN gaskets will invalidate joint warranties.

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Rubber Types

The Amarillo Fast-Grip gasket has the same cross section profile as AMERICAN’s Fastite gasket, so it can be used in any 4"-30" standard Fastite pipe socket. The gasket rubber is standard Styrene Butadiene Rubber (SBR), which meets all the material requirements of ANSI/AWWA C111/A21.11. SBR rubber gaskets are ANSI/NSF Standard 61 certified for contact with potable water.

Gaskets made of SBR are standard with all joint types. Consult AMERICAN for information or recommendations on gaskets made of special types of rubber, for applications involving air or liquid temperatures in excess of 150° F, or for chemical, hydrocarbon or other special service applications, and for installations in contaminated soils where permeation through gaskets might be a concern.

Common Name
or Trade Name1

Chemical Name

Common Uses

Maximum Service Temperature 2

Water & Sewer


Plain Rubber

Styrene Butadiene

Fresh Water, Salt Water
Sanitary Sewage




Ethylene Propylene
Diene Monomer

Water, Sewage, Ketones,
Dilute Acids and Alkalies,
Vegetable Oil, Alcohols, Air





Non-Aromatic Hydrocarbons,
Petroleum Oil, Hydraulic Fluids,
Fuel Oil, Fats, Oil, Grease4



Fluorel Viton®3


Aromatic Hydrocarbons, Gasoline,
Refined Petroleum Products, most
Chemicals and Solvents, High Temp.,
Air (Least permeable of all available
Fastite gasket rubbers)



1.) AMERICAN reserves the right to furnish any trade or brand rubber for the chemical formulation specified.

2.) Temperature is in reference to conveyed fluid. Lubricating oil in air can adversely affect SBR and EPDM performance. SBR, Nitrile and Neoprene are not recommended for hot air exposure in wastewater treatment systems.

3.) Viton® is a registered trademark of DuPont Dow Elastomers.

Product Line Information

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Pipe Manual
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