Diaphragm pump , comprising a pump head and a pump drive comprising a socket formed on the pump head and a mounting formed on the pump drive , wherein the socket formed on the pump head can be releasably fixed to the mounting formed on the pump drive via a rotary closure and the rotary closure comprises a securing device , wherein the mounting comprises at least two latching grooves and the socket comprises at least two complementary latching lugs for engagement with the latching grooves , in such a manner that the latching lugs are configured to be releasably fixed to the latching grooves via a rotational movement after insertion into the mounting characterized in that the - securing device is formed by a pushrod which is received in the mounting and is configured to be biased by a spring via a lever which engages positively into a hole formed on the socket when the pushrod is aligned with the socket-side hole, wherein - the pushrod locks automatically in the end position of the rotary closure as a result of the biased spring , - wherein the pushrod is mounted in a first sleeve fastened in a vertical hole in the mounting and a second sleeve is provided in the first sleeve for accommodating the spring and - the first sleeve for receiving the pushrod has an inclined ramp in such a manner that the pushrod is configured to be biased into a first position by rotation of the lever provided on the outer end of the pushrod , and is configured to be released into a second position by counter-rotation, wherein the biased pushrod engages into the hole of the socket as soon as the hole is aligned with the pushrod , - and wherein the latching grooves are formed internally in the mounting and the latching lugs are formed externally on the socket . - securing device is formed by a pushrod which is received in the mounting and is configured to be biased by a spring via a lever which engages positively into a hole formed on the socket when the pushrod is aligned with the socket-side hole, wherein - the pushrod locks automatically in the end position of the rotary closure as a result of the biased spring , - wherein the pushrod is mounted in a first sleeve fastened in a vertical hole in the mounting and a second sleeve is provided in the first sleeve for accommodating the spring and - the first sleeve for receiving the pushrod has an inclined ramp in such a manner that the pushrod is configured to be biased into a first position by rotation of the lever provided on the outer end of the pushrod , and is configured to be released into a second position by counter-rotation, wherein the biased pushrod engages into the hole of the socket as soon as the hole is aligned with the pushrod , - and wherein the latching grooves are formed internally in the mounting and the latching lugs are formed externally on the socket . - the pushrod locks automatically in the end position of the rotary closure as a result of the biased spring , - wherein the pushrod is mounted in a first sleeve fastened in a vertical hole in the mounting and a second sleeve is provided in the first sleeve for accommodating the spring and - the first sleeve for receiving the pushrod has an inclined ramp in such a manner that the pushrod is configured to be biased into a first position by rotation of the lever provided on the outer end of the pushrod , and is configured to be released into a second position by counter-rotation, wherein the biased pushrod engages into the hole of the socket as soon as the hole is aligned with the pushrod , - and wherein the latching grooves are formed internally in the mounting and the latching lugs are formed externally on the socket . <EOS>