"It is logical, and possibly in everyone's best interest, to assume a replacement valve could be procured from them and then modified to fit our systems."

He had been able to get some Chinese-made replacement valves.

Anticoagulants are needed over the long term if the replacement valve is mechanical.

Current replacement valves do not last forever-you may need to replace the valve in the future.

Can you suggest any replacement valves?

A variety of replacement valves are available.

A need for another replacement valve.

After replacement valves were fitted Walrus returned to active service in early 2001.

Now, cracks have been found in several replacement valves that have not even been installed.

That proposal has not officially been made, however, because Boeing is still designing the replacement valves.