מגוף מים
נמל תל-אביב
סמל נמל תל-אביב
יציקת המפרץ
C250 600 2007 תו תקן של מכון התקנים ת"י 489

Round lid surrounded by a square frame.

In 2018, an almost identical cover (with changes in the standard signs and their location) was photographed at 18 Tel Aviv Port, Israel Click for a larger image

In the center of the cap is the Tel Aviv Port stamp that was in use in 1936. The cap was created for the 70th anniversary celebrations of the Tel Aviv Port in 2006.
The stamp shows a sailor on a sailing ship holding the rudder of the ship behind him.

Translation of the text on the cover:
Water Valve
Port of Tel Aviv
The symbol of Tel Aviv Port
Yetzikat Hamifratz
The Standard mark of the Standards Institute of Israel C250 600 2007 IS 489