Best in 7 days
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Ships within 48 hours · Estimated delivery Jul 10 - Jul 15
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Description
S4721707977 | Genuine Wabco® Air Brake Relay Valve KitDescription: Air Brake Relay Valve Kit Condition: New Brand: Wabco Part Number: S4721707977 Weight: 5 lbs Fit for: Kenworth, Peterbilt Functions: Emergency braking: In the event of a loss of air pressure, the kit is designed to activate an emergency braking system. Parking brake: The kit may also be used to control the parking brake, which is applied to hold the vehicle in place when parked. Pressure control: The relay valve regulates the air pressure
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.3 ★★★★★
Based on 673 reviews
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Product Reviews
★★★★★ 1
It doesn’t stay in
The pipe keeps coming out. Not worth the money. Not sturdy to hold a top table.
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Reviewed in the United States on February 20, 2024
★★★★★ 2
Good finish, poor hardware.
Set screws are poor quality and are sometimes powdercoated on the exposed threads. Leads to striped hex sockets and inability to tighten properly.
Durable finish as evidenced by no visible damage after throwing parts across the shop in frustration.
Ended up running self tapping screws thru parts to complete assembly.
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Reviewed in the United States on February 26, 2024
★★★★★ 1
Kinda flimsy…
Thought the assembly was metal, it’s some kind of PVC.
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Reviewed in the United States on September 22, 2025
★★★★★ 5
Stable and easy to assemble
I used these to support a heavy piece of countertop would to create a side table. Looks great and holds steady.
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Reviewed in the United States on February 15, 2023
★★★★★ 5
Great
All pieces cut to perfection, went together perfectly
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Reviewed in the United States on October 22, 2023
