Quick-fit valve plate for Graco displacement pumps. Use to restore proper sealing and flow—confirm your pump’s parts diagram before ordering.
The Graco 166066 Plate Valve is a precision valve plate used inside select Graco piston/displacement pumps. It forms part of the internal check/valve assembly that controls fluid direction and supports consistent pump performance under demanding coating applications.
| Part Number | 166066 (166-066) |
|---|---|
| Component Type | Valve Plate (pump internal) |
| Typical Plate Size | 2 ½″ (≈ 64 mm) square |
| Application | Piston/displacement pump valve assembly |
| Question | Answer |
|---|---|
| Does this plate fit all Graco pumps? | No. It fits only models that specify part 166066 in their parts breakdown. Always confirm against your exact pump model. |
| How do I confirm compatibility? | Check your pump’s exploded parts diagram and verify both the part number and the plate dimensions/pattern listed for your model. |
| What happens if the wrong plate is installed? | Incorrect fit can cause leakage, reduced output, poor priming, or premature wear of the valve assembly. |
| Should I replace other parts at the same time? | Often yes. Inspect valve seats, checks/balls, and related seals; replacing as a set can restore full performance and reduce downtime. |
