These valves are available to set up your own plumbed system for a large aviary using your parts or to change out valves on your existing Bird Butlers or pipe system. The valves come pre-wrapped with tape and are ready to screw in. The variable valve is adjustable for use by the smallest of birds. Recommended for finches, canaries, lovebirds, doves, and birds up to cockatiel size. Has 1/8" male pipe thread.