Float box with valve

A float box for priming a fluid pump, the float box comprising:

• a suction inlet and a suction outlet between which a suction channel extends,
• a float housing that bounds a float chamber that is in fluid communication with the suction channel,
• a floater inside the float chamber, and
• an air valve assembly that is operated by the floater,
• wherein the air valve assembly comprises
• a valve holder above the float chamber that bounds a valve chamber and an insert opening towards the valve chamber, and
• a valve body that is inserted in the valve chamber in an insert direction via the insert opening,
• wherein the valve body comprises
• a valve cover that closes the insert opening, and
• a seal holder inside the valve chamber,
• wherein the seal holder has a seal chamber with an access opening where the seal chamber debouches spaced apart from the valve cover in the insert direction,
• wherein the air valve assembly comprises
• a seal element with a seal channel inside the seal chamber, and
• a valve head that is connected with the floater to close off and release the seal channel.