Style 39 insulating and reducing coupling
Style 39 insulating and reducing coupling

Dresser Style 39 - 62 | Insulating & Reducing Coupling

Nominal Size: 2 in
Outside Diameter | Cast Iron End X Steel End: 2.5 in X 2.375 in
Middle Ring Length: 5 in

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$1,039.07
SKU: 0032-0021-212
Weight : 12.0 lb
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Description
Dresser Insulating Reducing Coupling

Style 39-62 Insulating Reducing Coupling
Cast-Iron to Steel Pipe Transition

Combines size reduction, electrical isolation, and mechanical joining in a single coupling. Joins cast-iron pipe to steel pipe with different ODs while preventing galvanic corrosion at the transition point — eliminates the need for separate reducer + insulating flange + coupling assemblies.

Sizes 2 in – 24 in
Two Body Types Available
Cathodic Protection Ready
Dissimilar Metal Joining
Eliminates Reducer + Insulator Stack
Same-size pipe transition with insulation? If both pipe ends are the same OD and only electrical isolation is needed (not size reduction), the Dresser Style 39 Insulating Coupling is the right product.
View Style 39 →
Overview

The Dresser Style 39-62 Insulating Reducing Coupling is purpose-built for the most common — and most problematic — joint in waterworks and industrial piping: joining cast-iron pipe to steel pipe in the same system. Cast-iron and steel have different outside diameters at the same nominal size, and joining dissimilar metals creates galvanic corrosion that destroys joints from the inside out. The Style 39-62 solves both problems in one coupling.

The insulating gasket is typically furnished on the larger (cast-iron) end. A plastic insulating sleeve prevents pipe-end contact with the middle ring, and a sliding pipe end spacer separates the two pipe ends so they never make electrical contact. The armored gasket on the conductive (steel) end bonds the coupling to the pipe so cathodic protection current can pass through where needed. The result: a single coupling does the work of a reducer, an insulating flange kit, and a mechanical coupling combined.

Key Features
Three Functions, One Unit
Size reduction (cast-iron OD to steel OD), electrical isolation, and mechanical pipe joining — all in a single assembly. Eliminates the need for reducer fittings stacked with insulating flange kits.
Two Body Types Available
Type 1 (Standard) for typical pipe joining 2 in – 24 in. Type 3 (Long Body) with 12 in or 16 in middle ring for wider pipe separation or repair-span service.
CI End Insulating, Steel End Conductive
Standard configuration: cast-iron end fully isolated by Grade 41 insulating gasket plus Spec 100 plastic sleeve. Steel end uses armored Grade 27 BUNA-S for CP current sharing.
Multiple CI OD Classes
Different SKUs for different cast-iron pipe classes (A, B, C, D) at the same nominal size. Verify your cast-iron pipe's actual OD before ordering — see Pipe OD chart below.
Sliding Pipe-End Spacer
Internal spacer keeps the two pipe ends separated even under axial load, maintaining electrical isolation under thermal expansion and ground movement.
Fusion-Bonded Grey Epoxy
Factory-applied OD coating for corrosion resistance in buried and exposed service. ID bare to allow product flow without coating contamination.
Sizes 2 in – 24 in
Standard range covers distribution main to transmission line transitions. Larger sizes and special configurations available — consult inside sales.
Gas, Oil & Water Service
Widely specified on water mains, gas distribution, and oil transmission where cast-iron legacy pipe joins newer steel pipe, and where cathodic protection is required.
Materials of Construction
Followers
AISI C1012 or ASME SA36
Steel followers, both ends
Middle Ring
ASTM A513 / A635 / SA675 Gr.60
Reducing-profile steel sleeve
Bolts & Nuts
AWWA C111 / ANSI A21.11
Standard coupling hardware
Conductive End Gasket
Armored-Pinned Grade 27 BUNA-S
Steel end — bonds to pipe for CP current
Insulating End Gasket
Grade 41 with extended skirt
Cast-iron end — full electrical isolation
Pipe End Insulator
Dresser Spec 100 Plastic Sleeve
Prevents pipe-end contact with middle ring
Pipe End Separator
Sliding Spacer
Maintains gap between pipe ends
Coating
ID Bare / OD Fusion-Bonded Grey Epoxy
Factory-applied
Engineering References & Downloads
Style 39-62 Submittal PDF
Official Dresser product brochure covering Style 39-62 Insulating Reducing Couplings. Includes design rationale, materials of construction, exploded dimensional diagram, and complete Type 1 + Type 3 spec tables. For engineering review and project files.
Download Submittal
Pipe OD Reference Chart
Outside-diameter cross-reference for steel, PVC, polyethylene, ductile iron, cast iron (all classes), and asbestos cement pipe — sizes 1/2 in to 60 in. Critical for confirming both your cast-iron OD class AND your steel pipe OD before ordering.
Download Pipe Chart
Type 1 (Standard) Sizes & Specifications
Nominal Size OD Cast Iron (in) OD Steel (in) Middle Ring (Thick × Len, in) Bolts (No. × Diam × Len, in) Overall Diam. H (in) Overall Length L (in) Ship Wt (lbs)
2 in 2.500 2.375 .188 × 5 3 — 5/8 × 8-1/4 7-3/4 7 12
3 in 3.800 3.500 .203 × 5 4 — 5/8 × 8-1/4 7-3/4 7 16
4 in 4.800 4.500 1/4 × 7 4 — 5/8 × 8-1/4 9 9 23
4 in 5.000 4.500 1/4 × 7 4 — 5/8 × 8-1/4 9 9 25
6 in 6.900 6.625 1/4 × 7 6 — 5/8 × 8-1/4 11-3/4 9 31
6 in 7.100 6.625 1/4 × 7 6 — 5/8 × 8-1/4 11-3/4 9 31
8 in 9.050 8.625 1/4 × 7 6 — 5/8 × 10-3/4 13-1/4 9 38
8 in 9.300 8.625 1/4 × 7 6 — 5/8 × 10-3/4 13-1/4 9 38
10 in 11.100 10.750 3/8 × 7 8 — 5/8 × 10-3/4 15-9/16 9 58
12 in 13.200 12.750 3/8 × 7 8 — 5/8 × 10-3/4 17-3/4 9 83
12 in 13.500 12.750 3/8 × 7 8 — 5/8 × 10-3/4 19-5/16 9 85
16 in 17.400 16.000 3/8 × 7 10 — 5/8 × 10-3/4 21-3/8 9 110
20 in 21.600 20.000 3/8 × 7 12 — 5/8 × 10-3/4 25-5/8 9 127
24 in 25.800 24.000 3/8 × 7 14 — 5/8 × 10-3/4 29-13/16 9 162

Multiple OD options per nominal size correspond to different cast-iron pipe classes. Cast-iron pipe OD varies by class (A, B, C, D) and manufacturing standard — verify your actual CI OD before ordering. Reference the Pipe OD Chart above.

Type 3 (Long Body) Sizes & Specifications
Nominal Size OD Cast Iron (in) OD Steel (in) Middle Ring (Thick × Len, in) Bolts (No. × Diam × Len, in) Overall Diam. H (in) Overall Length L (in) Ship Wt (lbs)
4 in 4.80 4.500 1/4 × 12 4 — 5/8 × 15 9 13 24
6 in 6.90 6.625 1/4 × 16 6 — 5/8 × 19-1/2 11-3/4 17 51
8 in 9.050 8.625 1/4 × 16 6 — 5/8 × 19-1/2 13-1/4 17 62
10 in 11.100 10.750 3/8 × 16 8 — 5/8 × 19-1/2 15-9/16 17 111
12 in 13.200 12.750 3/8 × 16 8 — 5/8 × 19-1/2 17-3/4 17 130
16 in 17.400 16.000 3/8 × 16 10 — 5/8 × 19-1/2 21-3/8 17 167
20 in 21.600 20.000 3/8 × 16 12 — 5/8 × 20 25-5/8 17 211
24 in 25.800 24.000 3/8 × 16 14 — 5/8 × 20 29-13/16 17 252

Type 3 features a long-sleeve body: 12 in middle ring in the 4 in size, 16 in middle ring in nominal sizes 6 in through 24 in. Use Type 3 when pipe ends are widely separated or when bridging a repair gap is needed in addition to the reducing/insulating function.

When to Specify Style 39-62
Specify Style 39-62 whenever joining cast-iron pipe to steel pipe in the same system — particularly where cathodic protection is required or where galvanic corrosion is a concern. Most common application: connecting legacy cast-iron mains or stubs to newer steel transmission lines. If both pipes are the same OD (no reduction needed), use the Style 39 Insulating Coupling instead. If reduction is needed but isolation is not, use a standard Style 62 reducing coupling.
Consult Inside Sales For
Cast-iron OD class confirmation (A, B, C, or D), sizes above 24 in, alternative gasket compounds for non-standard service media, American Iron & Steel (AIS) or BABAA certification, all-stainless construction, or RED-D Shopcoat finish. We will confirm the correct CI OD, insulating configuration, and body type (Type 1 vs Type 3) for your specific application.
Ready to Order?
Confirm cast-iron pipe OD class, steel pipe OD, and body type (Standard or Long) before placing your order.
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Spec Sheet

Style 39-62 Insulating & Reducing Coupling Spec Sheet

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