Originally Posted by antonye
We use them on our 620 without any problem, makes taking the tank off really easy.
I think they came off ebay but look very much the same as what A&R sell.
Here are the ones we used.
LEGRIS quick disconnect
Sold by Flowtech 0845 456 1222 http://www.flowtech.co.uk/
6.4 mm ID with shut off when disconnected (in both sides)
Female side LE-9C230758P1 £5.40 each +VAT
Male Side LE-9C850758P1 £5.30 each + VAT
You may have a local stockist too, worth checking the local directory.
Mark (the pit 'biatch')