Features
- Compatible With: The 905-051 765 check valve assembly repair kit fits perfectly for Febco Model 1/2" & 3/4" Backflow PVB Repair. The Maximum working pressure is 150 psi. Replace Model 765 / 905051 / 765CBV / 765DBV.
- Strong & Long-Lasting: With precise CNC process manufacturing, ensuring easy installation and removal. The check valve assembly is made of high-quality brass and premium plastic with a layered technical structure for extra durability and sturdiness, which is impact-resistant, and corrosion-resistant for professional-level reliability and durability.
- Good As New: Troubling with leaking valve? This upgraded check valve assembly repair kit exceeding OEM standards can effectively help to repair the check valve and prevent contaminated water from entering the clean water supply system. Protect your water supply system for long-term and reliable performance.
- Easy Installation: When it comes to installing this check valve assembly, no special tools are required. Simply close the valve and open the test valve to release the residual pressure then replace the defective valve, clean, and grease before you install all the components. Then you can turn on the outlet valve, completing the repair.
- After-Sale Service: If you have any problems with this 905-051 765 Check Valve Assembly Repair Kit, please feel free to contact us. We are more than happy to help. Note: Please carefully check your machine model and required product size before purchasing.Package Includes: includes 1 x Holder, 1 x Screw, 1 x Disc.
Specifications
Color | Yellow |
Size | 1.18 x 1.37 x 1.06 inches |
Unit Count | 3 |
Related Tools
A three-piece check valve repair kit supplies the internal components needed to restore the check function of 1/2" and 3/4" backflow pressure vacuum breakers and prevent contaminated water from entering the potable supply. The kit includes the spring, retainer/holder and disc, is made from brass and plastic with CNC-machined parts, rated to 150 psi, and installs without special tools after depressurizing the line.
Sunluway 905-051 765 Check Valve Assembly Repair Kit, 3 PCS Replacement Fit for Febco 765 1/2" & 3/4" Check Valve of Model 765 Pressure Vacuum Breakers, Includes Spring, Retainer & Holder Yellow Review
Why I reached for this kit
My irrigation system’s old Febco 765 had started weeping out of the top every time the zones shut off. Classic symptom of a tired internal check: debris scoring the disc or a spring that no longer seats the check firmly. Rather than swapping the entire pressure vacuum breaker (and dealing with unions and alignment), I opted to rebuild the internals with the Sunluway 765 check valve kit. It’s a small, three-piece kit—disc, retainer/holder, and spring—rated to 150 psi and designed for 1/2" and 3/4" Model 765 units.
What it is—and what it isn’t
This is the lower check valve assembly, not the top bonnet or air-inlet “poppet” assembly. If your issue is water spitting from the air inlet after startup or a cracked bonnet, you’ll want the bonnet/poppet kit instead (or in addition). If you’re chasing persistent leak-by, pressure drop on zones, or water at the test cocks when the system is off, the check valve kit is the right place to start.
Compatibility is straightforward: it fits Febco 765 in 1/2" and 3/4" sizes. If you’re unsure of your size, check the markings on the ball valves flanking the PVB; they’re usually stamped 1/2" or 3/4". The kit’s parts are a direct swap for the originals and install without specialized tools.
Build quality and materials
The retainer/holder is machined cleanly, the spring sits true, and the disc is molded square to the holder. There were no burrs, flashing, or rough edges that might abrade the seat. The brass-and-plastic construction gives the right mix of stiffness (for the spring seat and retainer) and resilience (at the sealing surface). The overall impression is “OEM-grade” rather than cut-rate aftermarket. Nothing about the parts felt fussy or fragile.
The 150 psi working pressure rating covers typical municipal supply pressures with margin. I pressure-tested the rebuilt assembly to my street pressure (just under 80 psi) and saw tight closure without seepage.
Installation: quick, clean, and tool-light
My total hands-on time for the check valve portion was about 15 minutes, not counting prep and cleanup. Here’s what the process looked like for me:
- Isolate and depressurize. I closed the upstream and downstream ball valves, opened the test cocks to vent, and let the body drain out.
- Access the internals. I removed the bonnet/cover to lift out the upper assembly and expose the check valve below. No special tools were needed—just a screwdriver for the cover and a rag.
- Extract and inspect. The old check valve came out as a single piece. The disc showed wear and minor scoring; the spring had clearly softened with age.
- Clean the seat. I wiped the seat surfaces and flushed the line by briefly cracking the upstream valve with the body open to blow out grit. A clean seat is crucial for a reliable seal.
- Reassemble with light grease. I applied a thin film of potable silicone grease to the O-rings and contact surfaces (not on the sealing face of the disc) to ease assembly and prevent binding.
- Reinstall and reseat. With everything back in place, I cracked the upstream valve open quickly to “snap” the air inlet closed and seat the check. This helps the top valve seal on first charge and avoids nuisance dribble.
A couple of practical notes:
- You won’t need pullers or special spanners; everything is accessible once the bonnet is off.
- Keep track of test cock positions and return them to their original orientation after charging the system.
- If you’re in a hard-water area, expect some mineral buildup on the seat—take the time to clean it properly.
Performance after the swap
Before the rebuild, I had slow seepage at the test cock after shutdown and occasional air inlet dripping on startup. After installing the kit, the check sealed positively. Zones pressurized faster, and there was no weeping from the test ports. The system held static pressure between cycles without drift.
I deliberately cycled the system multiple times, including an overnight hold, to check for intermittent leak-by. The seal remained consistent, and the spring returned the disc to seat cleanly every time. Noise, which can accompany a fluttering or uneven check, was nonexistent.
Durability outlook
I can’t claim years of runtime yet, but there are a few indicators I look for in repair parts:
- Spring rate and set: this spring had good preload without feeling brittle, and it didn’t “take a set” after repeated cycles during testing.
- Machining and finish: clean contact surfaces reduce the risk of the disc cocking or tracking unevenly, which prolongs seal life.
- Material pairing: brass against the body and a compliant disc works well in these PVBs, and the parts here match that formula.
Assuming clean water and seasonal maintenance (winterization where needed), I expect the assembly to hold up through irrigation seasons without attention. As with any PVB, debris is the enemy—flush the line and keep the seat clean during service.
Value and alternatives
A full replacement PVB for 1/2" or 3/4" lines often costs in the low-to-mid hundreds and requires more labor: pipe alignment, unions, thread sealant, and re-pressurization with leak checks. A repair kit like this is a fraction of that cost and avoids disturbing the plumbing. Even if you end up pairing it with a separate bonnet/poppet kit for a full refresh, the combined spend is still reasonable and the time savings meaningful.
OEM parts are an option, but the Sunluway kit delivered the fit and finish I expect without the premium price. For many homeowners and pros alike, that’s the sweet spot.
Quirks and small cautions
- Scope of repair: This kit only addresses the check valve. If your top bonnet is cracked, sun-brittled, or the air inlet is leaking, you’ll need the companion upper kit.
- Correct sizing: It’s not for 1" and up. Confirm your size before ordering.
- Seating technique: After reassembly, charge the system briskly on the initial fill. A slow fill can leave the air inlet partially unseated and mimic a leak.
- Lubricants: Use a potable-grade silicone grease sparingly on O-rings and moving contact points; avoid greasing the disc’s sealing face.
Who will appreciate this kit
- Homeowners maintaining older Febco 765 PVBs on irrigation systems who want to stop leaks without replacing the whole assembly.
- Irrigation techs and plumbers who want a quick-turn repair with predictable fitment on 1/2" and 3/4" units.
- Anyone diagnosing slow pressure loss or weeping at test cocks that points to a worn check.
The bottom line
The Sunluway 765 check valve kit did exactly what I needed: it restored the sealing function of a tired Febco 765 without drama. The parts fit properly, the materials feel up to the task, and the installation was straightforward with no special tools. Performance after the swap has been tight and consistent, and the 150 psi rating inspires confidence for typical municipal service.
Recommendation: I recommend this kit for owners of 1/2" and 3/4" Febco 765 PVBs dealing with check valve leak-by. It’s a cost-effective, easy-to-install fix with OEM-like fit and finish. Just be sure your symptoms point to the check (not the bonnet), verify your valve size, clean the seat thoroughly, and you’ll likely be back up and running in under half an hour.
Project Ideas
Business
Mobile Backflow Repair Service
Offer a fast-response on-site service for irrigation, landscape and commercial clients to replace Febco Model 765 check valve internals. The kit’s easy-install design and no-special-tools requirement enable quick repairs, minimizing downtime. Sell recurring seasonal maintenance contracts (annual testing and parts replacement) and include a small parts inventory in your service van.
Ready-to-Use Repair Kits for Retail
Repackage the 905-051 765 assemblies into consumer-friendly kits with clear step-by-step instructions, grease packet, safety checklist and a how-to video link. Market on Amazon, Etsy and local hardware stores to DIYers and landscapers who need a reliable, OEM-exceeding replacement rated up to 150 psi.
Hands-On Training Workshops
Run paid workshops for municipal crews, irrigation contractors and homeowner associations teaching PVB maintenance and check valve replacement. Use multiple kits as take-home practice sets; include certification, troubleshooting guides, and an upsell for bulk parts or service contracts.
Wholesale Supply & Vendor Bundles
Sell these CNC-made replacement kits in bulk to plumbing wholesalers, irrigation contractors and landscape companies. Offer vendor bundles that include inventory management, reordering subscriptions, and value-added marketing materials (installation cards, video links). Position the product on durability and compatibility with Febco Model 765 as a lower-cost, higher-quality alternative to OEM single-part purchases.
Creative
Steampunk Pendant & Earring Set
Turn the CNC-machined brass holder, disc and small spring into wearable art. Clean and polish the brass, thread a short chain through the holder or fasten it to earring hooks, and seal with a thin layer of clear resin for durability. The layered technical look and yellow accent make eye-catching, low-cost jewelry sets sized around 1.18 x 1.37 x 1.06 inches.
Mini Kinetic Desk Sculpture
Use the spring and disc as a small moving element mounted on a hardwood or acrylic base. The strong brass parts and precise machining give a satisfying tactile and visual quality — add magnets or a finger-spin retainer so the disc oscillates. Great as a conversation piece or premium gift for plumbing/engineering clients.
Plumbing Education Demo Module
Build a clear acrylic housing that showcases the check valve assembly operating inside a backflow pressure vacuum breaker. Use the actual kit components to demonstrate check action, spring compression and sealing; include a small low-pressure hand pump and pressure gauge (stay below safe demo pressure) to teach homeowners, apprentices or students how backflow prevention works and how the 150 psi-rated parts compare to real systems.
Upcycled Hardware Keychains & Fridge Magnets
Glue a key ring or embed a rare-earth magnet into the plastic disc/holder to make durable keychains or decorative fridge magnets. Package in sets of three (matching the unit count) as novelty gifts for plumbing supply stores or trade-show swag.