SERIES D53 REGULATOR WITH BUILT-IN SLAM SHUT DEVICE SERIES D53 pressure regulator offers the possibility of installing an incorporated slam shut off device whenever it is functioning either as a main or as a monitor regulator. The incorporated slams shut off device can be retrofitted to SERIES D53 regulator without modifying the pressure reduction assembly. Thus all the specifications are same as that of SERIES D53 regulator. SLAM SHUT OFF This device cuts off the gas flow if any failure causes the downstream pressure to rise and reach the set point of the slam shut itself. The slam shut off device can be re-set manually.