Dresser · Insulating Reducing Coupling
Style 39-62 Insulating Reducing Coupling
Insulated cast iron to steel transition: insulating gasket on the cast iron end, conductive on the steel end, 2 in through 24 in.
150 PSI Max Working Pressure
212°F Max (Grade 27 and 41 Gaskets)
Grade 41 Insulating Gasket, Armored Grade 27
Carbon Steel Middle Ring and Followers
AWWA C111 Bolts
Fusion-Bonded Epoxy OD
Dresser Spec 100 Plastic Insulator
Factory-Rated per Order
2.38-25.80 in Pipe OD
12-252 lb Weight
Overview
Dresser Style 39-62 insulating reducing couplings are used where cast iron and steel pipe meet, and they stop the corrosion that joining dissimilar metals creates. The insulating gasket normally goes on the larger, cast iron end; a plastic insulating sleeve keeps the pipe ends off the middle ring and a sliding pipe end spacer separates them.
Application: Cast iron to steel transitions that must be electrically isolated, for cathodic protection or dissimilar metals.
- Type 1: standard middle rings, 2 through 24 in
- Type 3: long body, 12 in ring at 4 in and 16 in from 6 through 24 in
- Cast iron end insulating, steel end conductive
- Insulating sleeve and sliding pipe end spacer
What Ships and What It Needs to Run
Included: one middle ring, two followers, one Grade 41 insulating gasket, one armored Grade 27 gasket, insulating sleeve, pipe end separator, bolts and nuts.
Pipe prepared before install: plain pipe ends, clean and round where the gaskets seat.
Anchoring, by others: the coupling seals but does not restrain.
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.
Working Pressure
Dresser rates the Style 39-62 insulating reducing coupling to 150 PSI; special builds are rated per order.
Materials Specifications
| Followers |
AISI C1012 or ASME SA36 |
| Middle ring |
ASTM A513, ASTM A635 or ASME SA675 GR60 |
| Bolts |
AWWA C111 / ANSI A21.11 |
| Gaskets |
Armored-pinned Grade 27 Buna-S; Grade 41 on the insulating end |
| Coating |
ID bare, OD fusion-bonded grey epoxy |
| Pipe end separator and insulator |
Dresser Spec 100 plastic |
Source: Dresser Style 39-62 data sheet.
Sizes
Type 1 sizes (14)
| Nominal |
Cast iron OD (in) |
Steel OD (in) |
Middle ring |
| 2 |
2.500 |
2.375 |
.188 x 5 |
| 3 |
3.800 |
3.500 |
.203 x 5 |
| 4 |
4.800 |
4.500 |
1/4 x 7 |
| 4 |
5.000 |
4.500 |
1/4 x 7 |
| 6 |
6.900 |
6.625 |
1/4 x 7 |
| 6 |
7.100 |
6.625 |
1/4 x 7 |
| 8 |
9.050 |
8.625 |
1/4 x 7 |
| 8 |
9.300 |
8.625 |
1/4 x 7 |
| 10 |
11.100 |
10.750 |
3/8 x 7 |
| 12 |
13.200 |
12.750 |
3/8 x 7 |
| 12 |
13.500 |
12.750 |
3/8 x 7 |
| 16 |
17.400 |
16.000 |
3/8 x 7 |
| 20 |
21.600 |
20.000 |
3/8 x 7 |
| 24 |
25.800 |
24.000 |
3/8 x 7 |
Type 1, standard body.
Type 3 long body sizes (8)
| Nominal |
Cast iron OD (in) |
Steel OD (in) |
Middle ring |
| 4 |
4.80 |
4.500 |
1/4 x 12 |
| 6 |
6.90 |
6.625 |
1/4 x 16 |
| 8 |
9.050 |
8.625 |
1/4 x 16 |
| 10 |
11.100 |
10.750 |
3/8 x 16 |
| 12 |
13.200 |
12.750 |
3/8 x 16 |
| 16 |
17.400 |
16.000 |
3/8 x 16 |
| 20 |
21.600 |
20.000 |
3/8 x 16 |
| 24 |
25.800 |
24.000 |
3/8 x 16 |
Type 3, long body. Dresser Style 39-62 data sheet.
Installation Notes
- Clean dirt, rust, oil and loose scale from the pipe ends and check the gasket seat for gouges or grooves.
- On couplings, chalk-mark each pipe half the middle ring length plus 2 in back from the end to center the coupling.
- Slide the followers on, lubricate the gaskets, pipe OD and middle ring flares with soapy water or a non-petroleum lubricant, and seat the gaskets.
- Stab the pipe so each end sits at least 1 in past the gasket after deflection.
- Draw the nuts up finger tight, then tighten opposite sides evenly to the recommended torque; check every nut before backfilling.
Source: Dresser installation instructions for Styles 38, 40, 56, 62, 69, 71, 72, 76, 89, 128 and 168 (tag 0001-0737-999).
Before You Order. Measure the pipe OD with a pi tape and match it to the OD in the picker; cast and ductile iron run larger than steel of the same nominal size. Dresser builds couplings for odd ODs, other middle ring lengths, stainless steel and other gasket grades on request: email
sales@watermainsupply.com with the OD and the line content. Anchor the pipe: the coupling provides a pressure seal only, and Dresser requires the joint to be anchored wherever pipe pullout could occur. 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.
