[mike1986]

i want to change my di vessel fittings to john guest fittings. does any one know what size i need of these?

http://www.ebay.co.uk/itm/JG-Straight-Adaptor-1-4-PF-x-1-4-BPST-Tread-John-Guest-Conversion-Tube-Fitting-/190781108424?hash=item2c6b70b0c8:m:maY6ZB-9XNNik2p60oBJUcA

[Ian Lancaster]

It's been a long while since I needed to unscrew a DI connection, but I think the cylinder cap has a 3/4" female thread.