there's a housing estate near me that has this. I don't personally know if its right or wrong, all i know is its not very good! It practically bungs itself, its very tricky to get the systems to fill properly when there's no where to vent the air its replacing! Silly idea IMO.
for softus's benefit these are the systems i was thinking of when i said one bung. a lot of suprima and solo installs round here have an airsep and a single feed/vent.
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