Meter Bar Fittings & Accessories

Meter bar fittings and accessories are the small-but-critical components that connect, seal, and control gas flow at the natural gas meter set. Without the right swivels, nuts, gaskets, plugs, insulated unions, and lockwing cocks, a meter bar installation isn't just incomplete. It's a liability. Meter bar fittings and accessories come in a range of sizes, most commonly 3/4", 1", and 1-1/4", and are manufactured from cast iron, malleable iron, and rubber to handle the demands of residential and light commercial gas service. Getting the right fitting for the right position on the bar is the difference between a clean, code-compliant set and a callback before the inspector even shows up.

KEY SUBCATEGORIES / PRODUCT TYPES

Meter Swivels Meter swivels are threaded fittings that connect the gas distribution piping to the meter bar at the inlet and outlet ports. Straight swivels align inlet to outlet along the same axis, while offset swivels accommodate piping that doesn't line up perfectly with the meter's connection points. A.Y. McDonald's 20LT series straight swivel (SKU 4815-509) connects at 1" MNPT and is a common choice for residential meter sets. Wal-rich offset swivels are available in 3/4", 1", and 1-1/4" sizes and pair with matching meter nuts to complete the connection at the meter body.

Meter Nuts Meter nuts are the threaded fasteners that draw swivel fittings tight against the meter's inlet and outlet faces. The A.Y. McDonald 20LT gas meter nut (SKU 4815-507) is designed to connect straight or offset swivel fittings directly to the gas meter, and it's available in both black iron and brass finishes depending on utility requirements. Wal-rich black gas meter nuts come in 1" (SKU 0416804) and 1-1/4" (SKU 0416806) configurations. Nut selection has to match the swivel series. Mixing a 20LT nut with a 30LT swivel is a common mistake that can fall short of a proper seal.

Gaskets and Rubber Washers Gaskets and rubber washers sit between the swivel face and the meter body to create a gas-tight seal at the connection point. Wal-rich rubber washers for meter bars are available in 3/4" (SKU 0417602), 1" (SKU 0417604), and 1-1/4" (SKU 0417606) sizes. The 1-1/4" rubber washer for meter bar (SKU 0417606) is sized for 30LT pilot applications. A.Y. McDonald's 20LT gasket for swivels (SKU 4820-186) is the matching consumable for the 20LT swivel series. Replacing gaskets at every meter change-out is standard practice because a reused washer that's been compressed once can fail to seat properly the second time.

Insulated Unions Insulated unions for gas meter bars are three-part unions constructed from malleable iron with an internal insulating washer that breaks the electrical continuity between the meter and the distribution piping. Wal-rich malleable iron insulating unions are rated for working pressures of 150 to 175 psi and protect against stray or induced electrical currents that can cause galvanic and electronic corrosion at the meter connection. Insulated unions are available in black and galvanized finishes and in sizes from 3/4" through 2". Many gas utilities require insulated unions on all meter set assemblies, so confirming local utility specifications before ordering is the right move.

Lockwing Gas Cocks Lockwing gas cocks are plug-style shutoff valves installed at the meter bar to control gas flow and provide a tamper-evident or tamper-resistant means of shutoff. The Wal-rich 1-1/4" lockwing gas cock (Product # 0416006) is a cast iron valve rated to 175 PSI with a 1-1/4" FIP x FIP connection and a tamper-proof design. Lockwing cocks are a utility-required component in many jurisdictions, positioned either on the inlet side, outlet side, or both, depending on local gas codes. The lockwing feature prevents unauthorized operation without a specialized tool, which is exactly why utilities specify them on service connections.

Meter Plugs with Pressure Taps Meter plugs with pressure taps are used to cap unused tapped ports on the meter bar while still allowing a manometer or test gauge to check line pressure. Wal-rich 1" meter plug with 1/8" tap (SKU 0418802) and the 1-1/4" meter plug with 1/4" tap (SKU 0418804) are the two most common configurations for residential meter bars. Meter plugs with taps let technicians verify inlet and outlet pressure without breaking the meter connection. On a bar that doesn't have integral pressure taps, these plugs are the only way to confirm operating pressure without disconnecting from the meter.

BUYING GUIDE / HOW TO CHOOSE

Choosing the right meter bar fittings and accessories starts with matching the swivel series to the meter bar specification. A.Y. McDonald meter bars designate swivel compatibility in the model number itself. The 20LT designation refers to a 20 Light swivel with a flat gasket seal, while the 30LT series uses a heavier body rated for higher-demand applications. Wal-rich fittings follow a similar sizing logic keyed to NPT size and pilot designation. Confirm the swivel pilot size matches the gasket or rubber washer before placing an order.

Connection size is the next decision. Most residential meter bar fittings and accessories come in 3/4", 1", and 1-1/4" NPT. Larger commercial applications may require 1-1/2" or 2" insulated unions. The utility often dictates what size meter is installed, and the meter bar fittings have to match that meter's inlet and outlet thread dimensions exactly.

Insulation requirements vary by jurisdiction and utility. When the utility spec sheet calls for insulated unions, don't substitute a non-insulated union to save a step. The insulating washer inside a Wal-rich malleable iron insulating union, rated for 150 to 175 psi working pressure, is there for a reason. Without it, stray current corrosion can compromise the meter body and the service piping over time.

Finish choice is simpler. Black iron finish is the standard for above-ground natural gas applications. Galvanized finish is the call for exterior or moisture-exposed locations. Confirm with the local utility whether a specific finish is required before ordering insulated unions or nuts.

Finally, check whether the meter bar already has integral swivels. A.Y. McDonald meter bars ordered with the "2" spread designation in the model number include integral cast meter swivels, which means separate swivel fittings aren't needed. Ordering redundant swivels for a bar that already has them built in is a small mistake that wastes time on the day of installation.

FAQs

What is the difference between a straight swivel and an offset swivel for a gas meter?

The difference between a straight swivel and an offset swivel is the alignment between the meter's connection port and the field piping. Straight swivels connect inline when the field pipe meets the meter at the same axis. Offset swivels, like the A.Y. McDonald 20-10LT 3-5/8" offset swivel for gas meters (SKU 4815-712) at 3/4" MNPT, allow the piping to connect at an angle or offset position to compensate for misalignment between the meter and the service line. Selecting the wrong type can result in a fitting that physically won't make up or one that puts stress on the meter connection.

What size rubber washer is needed for a meter bar with a 1-1/4" connection?

The correct rubber washer size for a 1-1/4" meter bar connection is the 1-1/4" rubber washer for meter bar, available from Wal-rich in the 30LT pilot size (SKU 0417606). Rubber washers for meter bars come in 3/4", 1", and 1-1/4" sizes and must match both the NPT size and the pilot designation of the swivel being used. Using a washer sized for a different pilot can prevent proper seating and may result in a leak at the meter connection.

Are insulated unions required on natural gas meter bar assemblies?

Whether insulated unions are required on natural gas meter bar assemblies depends on the local gas utility's specifications and applicable codes. Wal-rich malleable iron insulating unions, rated for 150 to 175 psi working pressure, are designed to protect against stray and induced electrical currents that can cause galvanic corrosion at the meter connection. Many utilities do require insulated unions on all meter set assemblies, so the right move is to confirm the local utility's meter set specification before ordering fittings.

What is a lockwing gas cock and where is it installed on a meter bar?

A lockwing gas cock is a plug-style shutoff valve with a tamper-resistant wing or handle that requires a specialized tool to operate, preventing unauthorized gas shut-on or shut-off. On a meter bar assembly, the lockwing gas cock is installed on the inlet side, the outlet side, or both, depending on local gas code and utility requirements. The Wal-rich 1-1/4" lockwing gas cock (Product # 0416006) is cast iron construction, rated to 175 PSI, with 1-1/4" FIP x FIP connections. Lockwing cocks are a utility-specified component in many jurisdictions and aren't optional on regulated service connections.

How do meter plugs with pressure taps work on a gas meter bar?

Meter plugs with pressure taps are threaded plugs that cap unused ports on the meter bar body while incorporating a small NPT port that accepts a pressure test gauge or manometer connection. Wal-rich meter plugs are available in 1" with a 1/8" tap (SKU 0418802) and 1-1/4" with a 1/4" tap (SKU 0418804). Meter plugs with taps allow technicians to verify inlet and outlet line pressure at the meter set without disconnecting the meter or breaking the gas connection, which is the standard method for commissioning and troubleshooting at the service point.