Grimly Curmudgeon wrote:
On Tue, 23 Oct 2012 20:21:58 +0100, "Doctor Drivel"
wrote:

Insert a T-piece with a blanked vertical pipe from it of around a
foot length of 1" pipe. Leave it filled with air. It will act as a
shock absorber.

Until the air dissolves.

So put a Schraeder valve on top.

Oh my God, he wants to pump it up every few weeks.