(57) An interface portion (1), for a siphonic system (6) which siphonic system (6) has
an upstream portion (2) and a downstream portion (3), the interface portion (1) having
an inlet end (10), to be in connection with the upstream portion (2), a discharge
end (11), to be in connection with the downstream portion (3), the interface portion
(1) being arranged to bring, in use, the upstream portion (2) in liquid connection
with the downstream portion (3). The interface portion is distinguished by the inner
cross section area of the interface portion (1) increasing continuously from the inlet
end (10) to the discharge end (11) for a length (L) of the interface portion (1) that
is at least 0.3 times the inner diameter (D) of the discharge end (11), so that the
interface portion counteracts an accumulation of a gas downstream of the upstream
portion (2), to facilitate priming of the system.
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