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Dresser Replacement Gaskets: Grade 27, 42, Viton and Graphite
Dresser Grade 27 Buna-S Gasket - 1/2 in to 24 in
Dresser
Dresser Grade 27 Buna-S Gasket - 1/2 in to 24 in
- Price
- From $27.64
Dresser Style 65 Gaskets, Nuts & Retainer Cups
Dresser
Dresser Style 65 Gaskets, Nuts & Retainer Cups
- Price
- From $3.94
Dresser Grade 42 Buna-N Armored Gasket - 3/4 in to 24 in
Dresser
Dresser Grade 42 Buna-N Armored Gasket - 3/4 in to 24 in
- Price
- From $105.81
Dresser Grade 27 Buna-S Armored Gasket - 1/2 in to 24 in
Dresser
Dresser Grade 27 Buna-S Armored Gasket - 1/2 in to 24 in
- Price
- From $45.47
Dresser Style 90 Gaskets, Nuts & Retainer Cups
Dresser
Dresser Style 90 Gaskets, Nuts & Retainer Cups
- Price
- From $3.73
Dresser Viton Fluorocarbon Gasket - 1 in to 24 in
Dresser
Dresser Viton Fluorocarbon Gasket - 1 in to 24 in
- Price
- From $63.28
Dresser Style 138 Gasket - Cast & Ductile Iron Couplings
Dresser
Dresser Style 138 Gasket - Cast & Ductile Iron Couplings
- Price
- From $121.43
Dresser Style 4 & 41 Gasket - Collar Leak Clamps
Dresser
Dresser Style 4 & 41 Gasket - Collar Leak Clamps
- Price
- From $63.03
Dresser Style 60 & 160 Gasket - Bell Joint Clamps
Dresser
Dresser Style 60 & 160 Gasket - Bell Joint Clamps
- Price
- From $213.56
Dresser Grade 365 Graphite Fiber Gasket - High Temp
Dresser
Dresser Grade 365 Graphite Fiber Gasket - High Temp
- Price
- From $184.06
Dresser Replacement Gaskets: Grade 27, 42, Viton and Graphite
Dresser · Replacement Gaskets
Dresser Coupling, Clamp and Sleeve Gaskets
Genuine Dresser replacement gaskets for Style 38, 40 and 138 couplings, repair clamps, split sleeves and compression fittings: Grade 27, Grade 42, Viton, EPDM-rated and high-temperature graphite.
212°FGrade 27 and 42 max
350°FViton Grade 224 max
1,200°FGrade 365 graphite
NSF/ANSI 61Grade 27 drinking water
The gasket is what seals a Dresser coupling, clamp or sleeve, and its grade decides what the joint can carry and how hot it can run. Dresser molds each grade in its own rubber compound and marks it with a color code, so the grade can be read on the gasket. This collection holds Dresser replacement gaskets for couplings (Grade 27 Buna-S, Grade 42 Buna-N, armored versions of both, Viton Grade 224, Grade 365 graphite, pinned armored, STAB and Style 138), for repair clamps and split sleeves (Styles 4, 41, 54, 60, 73, 77, 80, 96, 126 and 160), and gasket sets for Style 65 and 90 compression fittings.
Gaskets are sized to a coupling style and pipe OD. Every variant ends with the Dresser part number. Call 1-888.510.4036 or email sales@watermainsupply.com. Genuine Dresser equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier.
Will It Work for Your Job?
Grade 27 Buna-S
The standard gasket: water, sewage, natural gas and general service, to 212°F. White mold code. NSF/ANSI 61 and 372 for drinking water.
Grade 42 Buna-N
Nitrile for oil, petroleum and hydrocarbon service, to 212°F. Yellow mold code.
Viton and high temperature
Viton Grade 224 handles hydrocarbons, alcohols and acids to 350°F at 100 PSI max. Grade 365 graphite runs to 1,200°F with no pressure rating. In Style 65, 88 and 90 compression fittings every grade is limited to 150°F.
Size It With Us
Send the pipe OD, pipe material and line content. We confirm the part number before you order. 1-888.510.4036 · sales@watermainsupply.com
Product Lines
The three grades most buyers need.
Grade 27 Buna-S
1/2 in to 24 in
Temp212°F max
CodeWhite
HardnessShore A 75
OD0.84 to 25.80 in
Plain wedge gaskets for Style 38 and 40 couplings: the default for water, sewer and gas lines.
- Armored version listed
- Drinking water certified
Best for Water and general service
View Grade 27 Buna-S
Grade 42 Buna-N
Temp212°F max
CodeYellow
HardnessShore A 75
OD2.38 to 24 in
Nitrile wedge gaskets for Style 38 and 40 couplings where oil or hydrocarbons would swell standard rubber.
- Armored version listed
- Oil and fuel resistant
Best for Petroleum and hydrocarbon lines
View Grade 42 Buna-N
Viton Grade 224
1 in to 24 in
Temp350°F max
Pressure100 PSI max
CodeBrown/tan
OD1.32 to 24 in
Fluorocarbon wedge gaskets for lines carrying hydrocarbons, aromatics, alcohols and acids, and for heat beyond nitrile.
- Steel and CIP sizes
- Also sold fitted in a coupling
Best for Chemical and hot lines
View Viton Grade 224
Compare the Line
| Listing | Fits | Grade | Max temp (Dresser) | Use |
|---|---|---|---|---|
| Grade 27 Buna-S | Style 38, 40 | 27 | 212°F | Water, gas, general |
| Grade 27 Armored | Style 38, 40 | 27 + brass coil | 212°F | Joints that must pass CP current |
| Grade 42 Buna-N | Style 38, 40 | 42 | 212°F | Oil and hydrocarbons |
| Grade 42 Armored | Style 38, 40 | 42 + brass coil | 212°F | Oil lines with CP |
| Viton Grade 224 | Style 38 | 224 | 350°F, 100 PSI | Chemicals, heat |
| Grade 365 Graphite | Style 38 | 365 | 1,200°F, no PSI rating | High temperature |
| Armored Pinned Grade 27 | Dresser couplings, steel | 27 | 212°F | Conductive pinned joints |
| STAB 38 and 40 | STAB couplings | Armored 27 | 212°F | STAB replacements |
| Style 138 | Style 138 | 27 | 212°F | Cast iron couplings |
| Style 4 and 41 | Collar leak clamps | 27 | 212°F | Collar clamps |
| Style 60 and 160 | Bell joint clamps | 27 | 212°F | Bell and spigot joints |
| Style 54 | Split sleeves | By sleeve | By sleeve | Gas sleeves 2 to 4 in |
| Style 73 | Split sleeves | By sleeve | By sleeve | Gas sleeves 2 in |
| Style 96 | Split sleeves | 500 PSIG | By sleeve | Steel sleeves 6 to 24 in |
| Style 80 | Split sleeves | By sleeve | By sleeve | End, side, grommet |
| Style 126 | Bell pack sleeves | By sleeve | By sleeve | End and side |
| Style 77 | Style 77 | Cone | By fitting | Cone 216 to 218 |
| Style 65 sets | Compression fittings | 27 or 42 armored | 150°F in fitting | Gaskets, nuts, cups |
| Style 90 sets | Compression fittings | 27 armored, 41 | 150°F in fitting | Gaskets, insulators, cups |
Quick rule: Water or gas, use Grade 27. Oil or fuel, use Grade 42. Chemicals or heat to 350°F, use Viton. Above that, Grade 365. Need cathodic protection current to pass the joint, choose the armored version of the grade.
Dresser Gaskets and Other Brands
Gaskets are made to fit one manufacturer's coupling geometry, so replace a Dresser gasket with a Dresser gasket. For Smith-Blair couplings, send us the style and pipe OD and we quote the matching Smith-Blair gasket.
Selection Guide
| Line content or condition | Grade | Notes |
|---|---|---|
| Drinking water, sewage, natural gas | 27 Buna-S | White code, 212°F |
| Oil, fuel, petroleum products | 42 Buna-N | Yellow code, 212°F |
| Hot water, steam, ozone exposure | EPDM 199 | Dresser rates 300°F, 250 PSI; ask us |
| Hydrocarbons, aromatics, alcohols, acids | Viton 224 | 350°F, 100 PSI max |
| Very high temperature, abrasive | 365 graphite | 1,200°F, no pressure rating |
| Joint must carry CP current | Armored 27 or 42 | Brass coil bites into the pipe |
| Compression fittings 65, 88, 90 | By fitting | All grades limited to 150°F |
Sizing and Best Practices
Match the coupling style and pipe OD
Each gasket fits one Dresser style and one pipe OD. Read the style from the coupling or the old part number and measure the pipe OD with a pi tape.
Read the mold code
Dresser marks each grade with a paint code: white for 27, yellow for 42, dark green for 41, light gray for EPDM and brown or tan for Viton. Match the code when replacing a gasket in service.
Armored gaskets
A brass coil molded into the gasket tip bites into the pipe for metal-to-metal contact, so cathodic protection current passes the joint. Use them where the line must stay electrically continuous.
Storage and shelf life
Dresser rubber can last well beyond five years when kept cool, dark and away from ozone, with storage below 80°F. Keep gaskets in their bags, flat, with nothing stacked on them.
Need help? Send the pipe OD and material to sales@watermainsupply.com and we confirm the Dresser part number.
Why Engineers Specify It
Color Coded
Grade is marked on every gasket.
Drinking Water Certified
Grade 27 meets NSF/ANSI 61 and 372.
Armored Options
Brass coil passes CP current.
High Temperature
Viton to 350°F, graphite to 1,200°F.
Exact Fit
Molded to Dresser coupling geometry.
Part Number Ordering
Every variant ends with the Dresser part number.
Related Dresser Products
Style 38 Bolted Coupling
Steel Pipe, 1/2 in to 48 inView
Style 40 Long Coupling
Steel Pipe, 1/2 in to 24 inView
Style 138 Bolted Coupling
Cast & Ductile Iron PipeView
Style 38 Coupling with Viton Gasket
1 in to 24 inViewGenuine Dresser parts, listed by Dresser part number.
Why Buy From Watermain Supply
Engineering-Led Selection
We check pipe OD, material and line content against Dresser data before we quote.
Multi-Brand Honesty
We carry Dresser and Smith-Blair. If one is not the right fit for your job, we say so.
Order by Part Number
Every variant ends with the Dresser part number, so you get exactly what the spec calls for.
Account Terms
Net terms for contractors, utilities and municipalities on approved accounts.
Data Sheets on Every Listing
Dresser technical specifications and installation instructions are attached to each product.
Gulf Coast Service
Houston-based team for the Gulf Coast and nationwide shipping.
Frequently Asked Questions
Which Dresser gasket grade do I need?
Grade 27 Buna-S for water, sewage and natural gas; Grade 42 Buna-N for oil and fuel; Viton Grade 224 for hydrocarbons, alcohols, acids and heat to 350°F; Grade 365 graphite for temperatures to 1,200°F.
What temperature can a Grade 27 gasket take?
Dresser rates Grade 27 to 212°F. In Style 65, 88 and 90 compression fittings the limit is 150°F.
What does an armored gasket do?
A brass coil molded into the tip bites into the pipe so cathodic protection current can pass the joint.
How do I tell which grade a gasket is?
By the mold paint code: white is 27, yellow is 42, dark green is 41, light gray is EPDM and brown or tan is Viton.
Is the Grade 27 gasket approved for drinking water?
Yes. Grade 27 is certified to NSF/ANSI 61 and 372.
Does the Grade 365 graphite gasket have a pressure rating?
No. Dresser rates it to 1,200°F with no pressure rating.
How long can I store Dresser gaskets?
Well beyond five years if kept cool, dark and away from ozone, below 80°F.
Can I use a Dresser gasket in another brand of coupling?
No. Gaskets are made for one manufacturer's coupling geometry. We quote the matching gasket for your coupling brand.
What warranty applies?
12 months from the date of purchase under Dresser published warranty terms.
Can I get a submittal?
Yes. Email sales@watermainsupply.com with the part numbers.
Ready to Size Your Gasket?
Send the pipe OD, material and line content. We confirm the Dresser part number and quote the same day.
Technical data on this page is taken from Dresser product literature and is subject to change by the manufacturer. Confirm against the current installation manual before specifying. Dresser, Viton (a trademark of its owner, used for identification), STAB are trademarks of Dresser, LLC, used here for product identification only. Watermain Supply is a DBA of E4 Industrial LLC, an independent industrial supplier based in Houston, Texas.
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