Single acting (SA) valve cartridge with emergency pawl. The diameter of the drill bit that drives you into the slot is 12.7 mm. It can be combined with different electrical coils of both 12 and 24 VDC or volts that have a hole for housing on the valve cartridge with a diameter of 13 mm. It is generally used by the manufacturer Anteo and in fact the coils that can be mounted for its operation are: Solenoid - Coil 12 Volts Ø13x39 Kostal M27x1 which is our code 32210T and Solenoid - Coil 24 Volts Ø13x39 Kostal M27x1 which is the equivalent to 24 Volts, code 32410T. Other electrical coils that can still be installed are our codes 32212T 32412T 32216T 32416T This valve being single-acting, it blocks the flow of oil in one direction, while in the other it always lets it pass. When electrically stimulated with the coil magnet, it also unlocks the other direction of the oil flow. On the other hand, double seal (DA) valve cartridges block the flow of oil in both directions. You can recognize a single-seal valve by the tip that it is hollow, while double-sealed or double-acting valves are solid. This cartridge IS EQUIPPED with an emergency pawl! This is located at the rear and is used in case there is a failure of the electric coil which at that point can no longer open the valve cartridge. If unscrewed, the pawl therefore allows the passage of oil and if necessary, to be able to open the bank or lower it to the ground. Attention: remember to shrink it as soon as the operation is finished! If you do not need a valve cartridge that has an emergency or if there is no physical space to mount it, being longer, you can opt to purchase item 31103T.