Dresser Style 138 coupling wedge gasket
Dresser Style 138 Gasket dimension drawing
Dresser Style 138 Gasket specification table
Dresser Style 138 Gasket specification table
Dresser Style 138 Gasket specification table
Dresser Style 138 Gasket specification table
Dresser Style 138 coupling wedge gasket
Dresser Style 138 Gasket dimension drawing
Dresser Style 138 Gasket specification table
Dresser Style 138 Gasket specification table
Dresser Style 138 Gasket specification table
Dresser Style 138 Gasket specification table

Dresser Style 138 Gasket - Cast & Ductile Iron Couplings

Nominal Size - OD Range: 4 in - 4.74-5.06 in OD
Section - Part No.: 1/2 x 1-3/16 in Wedge - 3138-0001-001

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$121.43
SKU: 3138-0001-001
Weight : 0.5 lb
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Description
Dresser · Coupling Gasket
Style 138 Coupling Gasket
Grade 27 wedge gaskets for Style 138 couplings on cast and ductile iron pipe, 4 through 12 in.
212°F Max
Grade 27 Buna-S
Wedge Section
For Style 138 Couplings
4.74-13.56 in Pipe OD
0.5-0.5 lb Weight
Overview

Replacement wedge gaskets for Dresser Style 138 couplings, the one-coupling-per-size design that fits cast iron of any vintage and modern ductile iron in 4 through 12 in.

Application: Re-gasketing Style 138 couplings on cast and ductile iron water mains.

  • Sections from Dresser’s book: 1/2 x 1-3/16 in through 8 in, 5/8 x 1-9/16 in at 10 and 12 in
  • Grade 27 Buna-S standard
What Ships and What It Needs to Run

Included: one gasket per part number.

Coupling or fitting parts, by others: followers, bolts and middle rings are not included unless named in the option.

Genuine Dresser equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier.
12-Month Dresser Warranty

Covered for 12 months from the date of purchase under Dresser’s published warranty terms.

Specifications
Material SBR Buna-S, Grade 27
Max temperature 212°F
Max pressure Per the coupling (Style 138: 250 PSI)

Dresser gasket grade overview and Grade 27 submittal, 2021.

Gasket Grades
Grade Rubber Max temperature Max pressure Mold code
27 SBR Buna-S 212°F Per coupling rating White
41 Natural 212°F Per coupling rating Dark green
42 Buna-N nitrile 212°F Per coupling rating Yellow
224 Fluorocarbon (Viton) 350°F 100 PSI Brown/tan
365 Graphite fiber 1,200°F None (may not seal leak-tight) —

Dresser gasket grade overview, 2021. In Style 65, 88 and 90 compression fittings the maximum is 150°F.

Storage: Dresser rubber gaskets keep five years or more on the shelf stored cool (32 to 80°F), dark and away from ozone, sunlight and weather, lying in their normal ID-OD position with nothing stacked on them.

Sizes
Nominal Size - OD Range Section
4 in - 4.74-5.06 in OD 1/2 x 1-3/16 in Wedge
6 in - 6.84-7.16 in OD 1/2 x 1-3/16 in Wedge
8 in - 8.99-9.36 in OD 1/2 x 1-3/16 in Wedge
10 in - 11.04-11.46 in OD 5/8 x 1-9/16 in Wedge
12 in - 13.14-13.56 in OD 5/8 x 1-9/16 in Wedge

Sizes as listed in Dresser’s 2026 price lists; the picker shows the part number for each build.

Before You Order. Match the pipe OD and the gasket section to the coupling or fitting; the part number is on the old gasket and in the coupling submittal. Non-stock Dresser parts are not returnable without Dresser’s authorization, and ship time is confirmed when you order. Custom builds (other sizes, widths, gaskets or materials) are available: email sales@watermainsupply.com with the pipe OD, material and line content.
For engineering-led sizing and selection support or a factory submittal, email sales@watermainsupply.com or call 1-888.510.4036.
© Watermain Supply — A division of E4 Industrial LLC
Data Sheet
Gasket Grade Overview (2021) Style 138 Cast/Ductile Iron Coupling Data Sheet Style 38, 138 and 40 Cast/Ductile Iron Submittal (2021) Gasket Shelf Life and Storage Bulletin
Videos

Product videos are being added to this listing. For a walkthrough in the meantime, email sales@watermainsupply.com.

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