On Thu, 30 Jul 2009 09:06:44 -0400, Hal wrote:

On Wed, 29 Jul 2009 17:57:00 +0100, Squeezy
wrote:

I use a drip watering system for my tomatoes etc when I go on holiday
and I use some Gardena fittings. After just 2 years of occasional use I
find the tiny thin 'O' rings are perished.

Measure carefully the cross section diameter and the circular diameter
of the O ring and google for what you need. Be prepared to look through
lots of charts.

Regards,

Hal

Keep in mind that O rings change diameter and thickness as they wear out.
I would suggest bringing your parts and o-ring to your local plumbing
supplier. O-rings come in standard sizes, and are common.