On 23 Oct, 13:56, "Dave Liquorice" wrote:
I certainly wouldn't go any smaller you need to be able to get your hands
in an possibly more importantly have a straight pull of more than 3"...

There must be telecom type things about as you often see BT type lids in
the pavement about that size. Donno on cost but might be worth comparing
against circular drainage holes bases, sides and covers.

--
Cheers
Dave. pam is missing e-mail

Cheers Dave,
Chris