Reusable rate limiter for akka streams

RateLimiter.scala

import akka.stream.FlowShape
import akka.stream.scaladsl.{Flow, GraphDSL, Source, Zip}

import scala.concurrent.duration.FiniteDuration

object RateLimiter {

  private def rateLimiter[A](rate: FiniteDuration) = {

    case object Tick

    Flow.fromGraph(GraphDSL.create() { implicit b =>
      import GraphDSL.Implicits._

      val ticker = b.add(Source.tick(rate, rate, Tick))
      val zip = b.add(Zip[A, Tick.type]())
      val unpack = b.add(Flow[(A, Tick.type)].map(_._1))

      ticker ~> zip.in1; zip.out ~> unpack

      FlowShape(zip.in0, unpack.out)
    })
  }

}

Would that be an appropriate implementation of a fixed rate limiter? I need this to limit http requests being made to a 3rd party site. I just plug this flow into the graph right before the connection pool.