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A.Y. McDonald 74M3WT Frame & Cover Assembly with Inner Lid, Model 4174-020
The A.Y. McDonald 74M3WT (Model 4174-020) is a frame and cover assembly with inner lid, built for use as part of an underground water service box or valve box setup. This rough-in component sits at grade over a curb stop or valve box, giving utility crews and plumbing contractors a durable access point down to the buried shutoff without disturbing the surrounding pavement or landscaping. The two-piece design pairs an outer frame and cover with a separate inner lid, a common configuration for water works boxes that need a secondary seal to keep debris and dirt out of the box riser between service calls.
Key Features
- Frame & Cover Design: Two-piece outer frame and cover assembly sized to fit over a standard water service or curb box riser.
- Inner Lid: Includes a separate inner lid (INR) that seats inside the frame for an added layer of protection against dirt, gravel, and surface debris entering the box.
- Model Reference: Cross-referenced as A.Y. McDonald model 4174-020 for accurate parts matching and reorder.
- Water Works Application: Designed for at-grade access to buried curb stops and valve boxes in water utility and plumbing rough-in installations.
- Replacement/Service Part: Suitable for replacing a worn or damaged frame, cover, or inner lid on an existing A.Y. McDonald box assembly.
Technical Specifications
- Model Number: 4174-020
- Manufacturer Part Number: 74M3WT
- Configuration: Frame and cover with inner lid
- Refer to manufacturer documentation for complete dimensional and material specifications.
Typical Applications
- Water Utility Curb Box and Valve Box Access Points
- Residential and Commercial Water Service Rough-In
- Replacement of Worn Frame, Cover, or Inner Lid Components
- New Construction and Underground Utility Installations
- Municipal and Contractor Water Service Maintenance
Why A.Y. McDonald?
A.Y. McDonald is a long-established name in water works and plumbing rough-in supply, and this 74M3WT frame and cover assembly with inner lid is built to match the fit and function of the model 4174-020 box components it is designed to service. Plumbing contractors and water utility crews can specify this part with confidence when replacing or completing a curb box or valve box assembly, keeping buried water service shutoffs accessible and protected at grade.
Manufacturer Resources
Product Specs
- list_batch:
- AYM-20260924
- Product Type:
- Valve Box Frame & Cover
- Configuration:
- Frame and Cover with Inner Lid
- Series:
- 4174-020
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Plumbing
A.Y. McDonald 74M3WT – Frequently Asked Questions
1) What exactly comes with the A.Y. McDonald 74M3WT frame and cover assembly?
The 74M3WT is a three-part assembly: an outer frame, a cover, and a separate inner lid that seats inside the frame. The inner lid is the second barrier that keeps dirt, gravel, and surface debris out of the box riser between service calls. A.Y. McDonald catalogs it as model 4174-020.
2) Is the 74M3WT the top section only, or does it include the box riser?
Top section only. The 74M3WT supplies the at-grade frame, cover, and inner lid that sit over a curb box or valve box riser. The riser pipe, the curb stop or valve itself, and any base or foot are separate items you order alongside it.
3) Can I use this to replace just a broken lid on an existing A.Y. McDonald curb box?
Yes, that is one of its intended uses. The 74M3WT is sold as a service part for replacing a worn or damaged frame, cover, or inner lid on an existing A.Y. McDonald box assembly. Match it to a 4174-020 box so the frame seats correctly on the riser you already have in the ground.
4) Do I need a frame and cover with an inner lid, or is a plain cover enough?
A plain cover is the simpler option when the box is in a lawn or a low-traffic area and you open it rarely. The inner lid version, like the 74M3WT, is what crews specify where the box sits in gravel, driveway, or pavement and debris would otherwise work its way down the riser and bury the shutoff rod. Two layers means the outer cover can take the surface abuse while the inner lid keeps the box clean enough to get a key on the stop.
5) What part number do I order to reorder this A.Y. McDonald cover again?
Order by manufacturer part number 74M3WT, cross-referenced to A.Y. McDonald model 4174-020. Quoting both keeps the frame, cover, and inner lid matched as a set when you reorder.
6) Is the A.Y. McDonald 74M3WT suitable for municipal water service work or just residential?
Both. It is used for at-grade access to buried curb stops and valve boxes in residential and commercial water service rough-in, new underground utility construction, and municipal maintenance work. Utility crews and plumbing contractors use the same part in each case.
7) Are there other configuration options for the 74M3WT, or is it a single item?
Single item. The 74M3WT is offered in one configuration, frame and cover with inner lid, with no finish, size, or style choices to specify on the order.
How fast can I get the A.Y. McDonald 74M3WT delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the A.Y. McDonald 74M3WT come with a warranty?
Absolutely. The A.Y. McDonald 74M3WT is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the A.Y. McDonald 74M3WT?
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