I’m not sure how generic it was but certainly the NZ NAC Viscounts (type 807) still had the plumbing in place for the tanks to be fitted.
In the case of ZK-BRF both ends of the lines are blanked off but obviously ready to be connected. In the under wing skins one can see the attachments for the tanks blanked off with rubber plugs.
The lines ran from the wing bays aft of the outer engines into the flap bays where they terminated at the under wing skin (in the fwd of these bays they would have interconnected with other plumbing by way, I assume, by replacement of one piece of plumbing which passes through the fwd bay and which the end of the line to the flap bay terminates nearby).
hth
“Much correspondence has flowed regarding slipper tanks on Viscount aircraft recently. In our previous Newsletter the focus was on NZNAC – New Zealand National Airways Corporation having the fittings but in fact the Corporation’s V.807s never had the actual tanks fitted, even during the delivery flights, as indicated on ZK-BRF’s above photo.”
http://www.vickersviscount.net/newsletters/Newsletter1110.aspx
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