Description
Square swimming pool main drain grate and frame kit for 9 in x 9 in openings. Includes the grate, matching frame, and mounting hardware for installation in pool floors or walls. Designed for standard 3 in plumbing connections and certified to meet UL safety listing requirements.
Quick Answer: What Is the Waterway 640-4790 V?
The Waterway 640-4790 V is a drain & suction cover: Waterway 9" x 9" Square Grate & Frame, White. It is brand new, ships in 1-2 business days, and is backed by the Waterway manufacturer warranty.
Waterway 640-4790 V Specifications
| Brand | Waterway |
|---|---|
| Equipment Type | Drain & Suction Cover |
| Model Number | 640-4790 V |
| Color | White |
| Pool Type | Gunite |
| UPC | 806105452924 |
Key Features
- Total open area 43.6 sq. in.
- Frame outer size 10.375 x 10.375 in.
- Fits 9 x 9 in. grate opening
- Floor flow rate 240 GPM with 3 in. plumbing
- Wall flow rate 208 GPM with 3 in. plumbing
- Flow rate 203 GPM at 1.5 ft/sec
How It Works
Drains, skimmers, return inlets, jets and plugs are the plumbing fittings where water leaves and returns to the pool or spa. Skimmers pull surface debris, main drains draw from the deep end, returns and jets push filtered water back, and plugs seal lines for winterizing or service. Suction covers must meet current VGB and ANSI/APSP-16 standards to prevent entrapment.
How to Choose the Right Drain & Suction Cover
- Match the pool type (gunite/concrete, vinyl liner, fiberglass) and the existing fitting brand and size.
- For suction covers, confirm the flow rating, mounting pattern and service life marked on the cover.
- For jets and returns, match thread size and insert style.
- For plugs, match pipe size and plug type (threaded, expansion or winterizing).
If you are replacing an existing part, the fastest way to confirm compatibility is to match the brand and model number on the old equipment. Send us the model number or a photo of the label and our team will help confirm the 640-4790 V is the right fit before you order.
Installation and Safety
Suction outlet covers must be installed exactly as certified, with the correct screws and sump. Replace any cover that is cracked, loose, missing screws or past its expiration date. Structural fittings in a pool shell should be installed by a qualified pool builder.
Maintenance Tips
- Inspect drain covers regularly and replace at the marked expiration date.
- Check skimmer baskets and weirs weekly.
- Lubricate O-rings on threaded fittings.
- Use winterizing plugs properly in freezing climates.
What's Included
This listing is for the Waterway 640-4790 V as described in the specifications above. Plumbing, wiring, unions and accessories are not included unless they are listed in the product name or specifications.
Built for Homeowners, Pool Pros and Property Managers
- Homeowners: match your existing model number, then reach out if you want a second set of eyes on compatibility before you order.
- Pool service pros and builders: order quickly, track every shipment, and reorder common parts for your routes and builds.
- Property managers and commercial pools: standardize equipment across properties and plan replacements with help from our team.
White Paper
- 9" x 9" Grate and Frame - 810-4780 - Certificate of Compliance (PDF)
- 12" x 12" Grate and Frame - 810-0253 - Certificate of Compliance (PDF)
Frequently Asked Questions About the Waterway 640-4790 V
Does my drain cover expire?
Yes. VGB-compliant covers are marked with a service life; replace them by that date or sooner if damaged.
How do I match a jet or return fitting?
Check the brand, thread size and insert style of the existing fitting.
Why is my skimmer not pulling well?
Check for a clogged basket, low water level, a stuck weir or a valve setting that favors the main drain.
Is this the genuine Waterway part?
Yes. It is brand new Waterway equipment (model 640-4790 V) covered by the manufacturer warranty. Warranty terms vary by product and application; see the manufacturer documentation or ask our team.
