---
title: "readAttributeMaxConstFlow(completionHandler:)"
framework: matter
role: symbol
role_heading: Instance Method
path: "matter/mtrbaseclusterpumpconfigurationandcontrol/readattributemaxconstflow(completionhandler:)"
---

# readAttributeMaxConstFlow(completionHandler:)

## Declaration

```swift
func readAttributeMaxConstFlow(completionHandler: @escaping @Sendable (NSNumber?, (any Error)?) -> Void)
```

```swift
func readAttributeMaxConstFlow() async throws -> NSNumber
```