Dresser · Coupling Gasket
Grade 42 Buna-N Armored Coupling Gasket
Armored Grade 42 nitrile wedge gaskets for Style 38 and 40 couplings on oil and hydrocarbon lines, 3/4 through 24 in.
212°F Max
Grade 42 Buna-N Nitrile
Armored: Brass Coil in Tip
Oil and Hydrocarbon Resistant
For Cathodic Protection
1.05-24.00 in Pipe OD
0.5-0.5 lb Weight
Overview
Armored Grade 42 gaskets combine Dresser’s oil-resistant nitrile with a molded brass coil that bites into the pipe for metal-to-metal contact, so the joint passes cathodic protection current on hydrocarbon lines.
Application: Cathodically protected oil, fuel and condensate lines.
- Wedge gaskets for Dresser Style 38 and Style 40 bolted couplings (Style 40 uses Style 38 followers and gaskets) on plain-end steel pipe; CIP sizes fit couplings for cast and ductile iron.
- Nitrile compound with molded brass armor
- Resists oil, hydrocarbons, condensates and gasoline
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 |
Buna-N nitrile, Grade 42, with molded brass armor |
| Hardness |
Shore A 75 ± 5 |
| Max temperature |
212°F |
| Max pressure |
Per the coupling it is installed in |
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
All sizes (23 rows)
| Nominal Size - OD |
Section |
| 1-1/2 in - 1.90 in OD |
11/32 x 5/8 in |
| 3 in - 3.50 in OD |
1/2 x 29/32 in, 3/8 x 7/8 in |
| 3-1/2 in - 4.00 in OD |
1/2 x 29/32 in, 3/8 x 7/8 in |
| 4 in - 4.50 in OD |
1/2 x 29/32 in, 3/8 x 7/8 in |
| 4 in CIP - 5.00 in OD |
1/2 x 29/32 in |
| 5.50 in OD |
1/2 x 29/32 in |
| 6.00 in OD |
1/2 x 1 in |
| 3/4 in - 1.05 in OD |
9/32 x 9/16 in |
| 1-1/4 in - 1.66 in OD |
9/32 x 9/16 in |
| 10.00 in OD |
1/2 x 1 in |
| 14 in - 14.00 in OD |
1/2 x 1-1/8 in, 5/8 x 1-3/16 in |
| 16 in - 16.00 in OD |
1/2 x 1-1/8 in, 5/8 x 1-3/16 in |
| 18 in - 18.00 in OD |
1/2 x 1-1/8 in, 5/8 x 1-3/16 in |
| 20 in - 20.00 in OD |
1/2 x 1-1/8 in, 5/8 x 1-3/16 in |
| 22 in - 22.00 in OD |
1/2 x 1-1/4 in, 5/8 x 1-3/16 in |
| 24 in - 24.00 in OD |
1/2 x 1-3/16 in, 5/8 x 1-3/16 in |
| 1 in - 1.32 in OD |
9/32 x 9/16 in |
| 10 in - 10.75 in OD |
1/2 x 1-1/8 in, 5/8 x 1-3/16 in |
| 12 in - 12.75 in OD |
1/2 x 1-1/8 in |
| 2 in - 2.38 in OD |
1/2 x 29/32 in, 3/8 x 3/4 in |
| 2-1/2 in - 2.88 in OD |
1/2 x 29/32 in |
| 6 in - 6.63 in OD |
1/2 x 1 in, 3/8 x 7/8 in |
| 8 in - 8.63 in OD |
1/2 x 1-1/16 in, 3/8 x 7/8 in |
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.
