Dresser Pipeline Service Saddle

The Dresser Style 91 Service Saddle provides a leak-free, mechanically clamped tapping point on existing distribution mains — cast iron or steel — without dewatering the system. Install, tap, and bring the new service into operation in a single crew operation.

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Dresser Style 91 | Service Saddle | Steel Pipe
style 91 service saddle

Dresser

Dresser Style 91 | Service Saddle | Steel Pipe

From $132.50
Dresser Style 91 | Service Saddle | Cast Iron
style 91 service saddle

Dresser

Dresser Style 91 | Service Saddle | Cast Iron

From $141.91
Dresser Pipeline Service Saddle
Description

Dresser Style 91 Service Saddles

The Dresser Style 91 Service Saddle provides a leak-free, mechanically clamped tapping point on existing distribution mains — cast iron or steel — without dewatering the system. Install, tap, and bring the new service into operation in a single crew operation.

91
Style Number
CI & Steel
Pipe Series
Live-Tap
Capable
Product Lines
Style 91 — Two Pipe Series
The saddle body and outlet configuration are identical. The difference is the curved saddle face, which is machined to match either cast iron or steel pipe OD geometry.
91Cast Iron
Style 91 — Cast Iron Pipe
Saddle face radius machined for cast iron OD dimensions. The body straps wrap around the CI main body, and the follower ring compresses the gasket against the machined saddle face for a pressure-tight seal without disturbing the pipe.
CI OD RadiusThreaded OutletAWWA C800
91Steel Pipe
Style 91 — Steel Pipe
Saddle face machined to IPS steel pipe OD radius. Used for new service taps on steel mains or for adding branch outlets to existing steel distribution systems. Same threaded CC outlet standard as the CI version.
IPS OD RadiusCC Outlet ThreadSteel Mains
Mechanism
How the Style 91 Creates a Pressure-Tight Tap
Five components, one sealed tapping point — no hot-tapping machine required in most water utility applications.
Component Sequence
1
Saddle Body
Cast body with integral branch outlet and machined concave saddle face. The face radius matches the pipe OD to maximize gasket contact area.
2
Strap Bolts
Two or more U-bolts or strap assemblies wrap around the main pipe body. Tightening these bolts draws the saddle face against the pipe OD.
3
Gasket
Elastomeric gasket compressed between saddle face and pipe OD. Grade 27 (Buna-S) standard for potable water. Grade 42 (Buna-N) for oil-contaminated environments.
4
Branch Outlet
Threaded corporation-cock (CC) outlet. The pipe is tapped through this outlet using a corporation stop drill tap tool after the saddle is installed and pressure-tested.
5
Corporation Stop
Not part of the saddle but installed in the branch outlet immediately after tapping. Provides shut-off isolation for the new service.
Critical Specification
Why the Saddle Face Radius Cannot Be Interchanged
A steel-pipe saddle installed on cast iron pipe creates a saddle face that bridges the pipe OD rather than conforming to it. The result is a gasket compressed only at two points — not uniformly — and a seal that will fail under pressure cycling.
Nominal Size Steel IPS OD Cast Iron OD Radius Difference
4" 4.500" ~4.80" 0.15"
6" 6.625" ~6.90" 0.14"
8" 8.625" ~9.05" 0.21"
10" 10.750" ~11.10" 0.18"
12" 12.750" ~13.20" 0.23"
Field Identification Tip

If the main was installed before 1960, assume cast iron. If after 1985, assume ductile iron or steel. For any main installed 1960–1985, measure the OD with a wrap tape and compare to the table above to confirm material class before ordering the saddle.

PVC C900

PVC C900 uses cast iron OD dimensions. If adding a service tap to a C900 main, specify the cast iron saddle series — not the steel series.

Field Procedure
Live-Tap Installation Sequence
The Style 91 allows tapping a pressurized main without service interruption. Follow this sequence for a leak-free result.
1
Clean and Mark
Clean the pipe OD at the tap location. Mark the centerline and confirm no voids in the pipe wall at that location using sounding if the pipe material is unknown. Locate tap point away from existing bell joints.
2
Install and Torque Saddle
Slide the gasket and saddle body into position. Tighten the strap bolts alternately and in stages per the Dresser torque table. Pressure test the assembly at 1.5× working pressure before drilling.
3
Tap and Install Corp Stop
Thread the corporation drill tap tool into the outlet, drill through the pipe wall, retract the cutter, and immediately thread in the corporation stop before withdrawing the tool. Service line can then be connected to the corp stop.
Technical Reference
Key Specification Parameters
Confirm all four parameters on your order to avoid a return or substitution delay.
Pipe Material: CI or Steel (governs saddle face radius) Pipe Nominal Size: 2"–12" typical Outlet Thread: CC (Corporation Cock) standard Gasket Grade: 27 (water) or 42 (petroleum-contaminated soil) Body Coating: Fusion Epoxy standard Working Pressure: Verify per size/material

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Contact our team for availability, custom sizing, and volume pricing on Dresser Utility Solutions products.

Email sales@watermainsupply.com Call 281.664.8000