Wilkins RK8-350 | Repair Kit for 8"-10" Double Check Backflow Preventers
Wilkins RK8-350 | Repair Kit for 8"-10" Double Check Backflow Preventers is backordered and will ship as soon as it is back in stock.
Shipping
Shipping
🚚✨ Free Shipping in the Continental U.S.
All Products. No Minimums.
Estimated Shipping Times:
Important Note on Delivery Times
All shipping estimates provided are approximate only. While we always strive to meet or exceed your delivery expectations, we cannot guarantee the exact delivery times listed.
For time-sensitive orders, please contact us directly so we can provide a more accurate lead time estimate based on your specific requirements.
Same Day Shipping
All in stock orders received before 3PM EST will ship the same day. Orders received after 3PM EST will ship the following business day.
Water Filters, Hand Dryers, & Indoor Bottle Fillers are our most popular in stock items.
Outdoor Tubular Drinking Fountains
Evergreen normally ships in 5-15 days. Black, Gray and Blue ship in 2-4 weeks.
Ice Machines
In stock units ship within 48 hours. Other units normally ship in 2-4 weeks.
Other
Orders that ship directly from a manufacturer normally have a firm shipping estimate but those dates are subject to change due to manufacturer production, inventory or shipping. We do our best to estimate ship dates but orders shipping directly from the manufacturer can have unexpected delays. We will confirm tracking information when orders ship directly from a manufacturer but may not have updates or estimates beyond the original estimate. Once your order is placed with the manufacturer, it may not be able to be cancelled even if it hasn't shipped yet.
Please contact support@bottlefillingstations.com to confirm delivery time for a specific product or quantity. Or to inquire about an existing order.
Special Case Shipping Rates
Please note that shipping rates are subject to change at any time. We reserve the right to charge an additional fee in addition to the regularly advertised shipping fee for shipping to remote areas not easily accessible by typical freight carrier means (i.e. islands only accessible by ferry). If your order falls into this category, you will be notified upon receipt of your order, and have the option to complete the purchase with additional fee or to cancel the order. Please note, these instances are very rare, as most locations are reachable by regular freight. If you have any questions, please contact us!
Key Terms & Conditions
Exceptions may apply to islands and other remote territories.
All orders shipped by the carrier of our choice.
The Wilkins RK8-350 is a standard repair kit designed for 8"-10" Model 350A/375/475 and 8"-12" Model 350/450 Double Check Backflow Preventers, providing essential seals and o-rings for quick restoration of backflow prevention function.
Key Specifications:
- Compatible Sizes: 8 to 12 Inches
- Kit Components: Two check o-rings, twelve poppet bolt o-rings, two seal rings
- Compatible Models: 350A, 375, 475, 350, 450
- Notable Certifications: ASSE 1015, CSA B64.5
- Application: Double check backflow preventers
Other Related Variants:
- RK1-350: 1 Inch version with check assemblies
- RK34-350: 3/4 Inch version with check assemblies
- RK4-350: 2 1/2 to 4 Inch version
- RK6-350: 6 Inch version
- RK212-350: 2 1/2 Inch version
Materials:
- Quality o-ring materials for long-lasting seal performance
- Durable seal ring materials designed for extended service life
Typical Installation:
Used for repair and replacement of internal seals and o-rings in 8"-10" Model 350A/375/475 and 8"-12" Model 350/450 Double Check Backflow Preventers to restore proper backflow prevention function and avoid full assembly replacement in commercial, industrial, and municipal water supply systems.
Standards Compliance:
ASSE 1015; CSA B64.5
Features & Benefits:
- Complete Repair Solution: The Zurn RK8-350 includes all necessary o-rings and seal rings for comprehensive backflow preventer maintenance without requiring full assembly replacement.
- Quality Construction: Manufactured with durable materials designed for long-lasting performance and reliable sealing in demanding water supply applications.
- Cost-Effective Maintenance: Enables quick repair and restoration of backflow prevention function, reducing downtime and avoiding expensive full unit replacement.
- Certified Performance: Complies with ASSE 1015 and CSA B64.5 standards, ensuring reliable backflow prevention in critical water supply protection applications.
FAQ
Q: What components are included in the Wilkins RK8-350 repair kit?
A: The kit includes two check o-rings, twelve poppet bolt o-rings, and two seal rings for comprehensive seal replacement.
Q: Which backflow preventer models are compatible with this repair kit?
A: This repair kit is designed for 8"-10" Model 350A/375/475 and 8"-12" Model 350/450 Double Check Backflow Preventers.
Q: Can this repair kit replace a full backflow preventer assembly?
A: Yes, the Zurn RK8-350 allows you to restore backflow prevention function by replacing internal seals and o-rings, avoiding the need for costly full assembly replacement.
NOTICE: Do not use with water that is unsafe or of unknown quality without adequate disinfection either before or after the system.
"Hydrate Everyone, Everywhere!" BottleFillingStations.com | Contact us
Always consult with a licensed professional and check local codes before installation. For further details, check the Owners Manual.
Contact us at support@bottlefillingstations.com with any questions.




