Bracket mounting inserts found on the standard ISE20 are omitted as well.  25A-ISE20 is UL/CSA, CE and RoHS compliant with an IP40 enclosure rating.

Number of Ports: 3 Port, Piping Direct., Plunger Length: 0 (Side Ported, Long), Body Option: Side Mounting, Port Size: N01 (NPT 1/8, Side Ported Only), Actuator Type: 34 (Twist Selector, 2 Position), Suffix: Y (Yellow), Indicator: None

Number of Ports: 3 Port, Piping Direct., Plunger Length: 1 (Side Ported, Short), Body Option: Side Mounting, Port Size: N01 (NPT 1/8, Side Ported Only), Actuator Type: 35 ( Twist Selector, 3 Position), Suffix: Y (Yellow), Indicator: None

Number of Ports: 2 Port, Piping Direct., Plunger Length: 0 (Side Ported, Long), Body Option: Side Mounting, Port Size: N01 (NPT 1/8, Side Ported Only), Actuator Type: 34 (Twist Selector, 2 Position), Suffix: Y (Yellow), Indicator: None

Output Specification: Y (PNP Open Collector 2 Outputs + Copy Function), Unit Specification: Unit Selection Function, Switches w/Unit Selection not Permitted for Use in Japan, Piping Specification: N01 (NPT 1/8), Lead Wire: W (Lead Wire w/Connector, 5-core, 2 m Lead Wire, Waterproof), Bracket: None, Operation Manual: Y (w/o Operation Manual, w/o Calibration Certificate)

The ISE2 series is a compact, pressure switch (for positive pressure) and can be integrated with ZX or ZR vacuum systems. The ISE2 series pressure switch has a quick response time of 10mS and the plug connector option makes wiring easy and simple., 3-Screen High Precision Dig Press Switch, PRESSURE SWITCH, ISE1-6, 32.00000 lb

Rated Vacuum Range: -101 to 0 kPa, Output Specification: P (PNP Open Collector 1 Output), Unit Specification: P (w/Unit Selection Function, Initial Value psi), Piping Specification: M5 (M5 Female Thread), Option 1: w/o Lead Wire, Option 2: A1 (Bracket A, Vertical Mounting), Option 3: Y (w/o Operation Manual, w/o Calibration Certificate)

Output Specification: Y (PNP Open Collector 2 Outputs + Copy Function), Unit Specification: M (SI Unit Only), Piping Specification: N01 (NPT 1/8), Lead Wire: J (Lead Wire w/Connector, 5-core, 2 m Lead Wire), Bracket: A1 (Bracket A, Vertical Mounting)

Output Specification: Y (PNP Open Collector 2 Outputs + Copy Function), Unit Specification: M (SI Unit Only), Piping Specification: N01 (NPT 1/8), Lead Wire: w/o Lead Wire, Bracket: A1 (Bracket A, Vertical Mounting), Operation Manual: K (Operation Manual, Calibration Certificate)

Number of Ports: 3 Port, Piping Direct., Plunger Length: 0 (Side Ported, Long), Body Option: U (w/Bottom Mounting Thread), Port Size: N01 (NPT 1/8, Side Ported Only), Actuator Type: 30 (Push Botton, Mushroom), Suffix: Y (Yellow), Indicator: None

Number of Ports: 2 Port, Piping Direct., Plunger Length: 0 (Side Ported, Long), Body Option: U (w/Bottom Mounting Thread), Port Size: N01 (NPT 1/8, Side Ported Only), Actuator Type: 32 (Push Button, Extended), Suffix: Y (Yellow), Indicator: None

Number of Ports: 2 Port, Piping Direct., Plunger Length: 0 (Side Ported, Long), Body Option: Side Mounting, Port Size: N01 (NPT 1/8, Side Ported Only), Actuator Type: 30 (Push Botton, Mushroom), Suffix: Y (Yellow), Indicator: None, Bracket: B (w/Bracket)

Number of Ports: 2 Port, Piping Direct., Plunger Length: 0 (Side Ported, Long), Body Option: Side Mounting, Port Size: N01 (NPT 1/8, Side Ported Only), Actuator Type: 32 (Push Button, Extended), Suffix: Y (Yellow), Indicator: None, Bracket: B (w/Bracket)

Number of Ports: 2 Port, Piping Direct., Plunger Length: 0 (Side Ported, Long), Body Option: U (w/Bottom Mounting Thread), Port Size: N01 (NPT 1/8, Side Ported Only), Actuator Type: 34 (Twist Selector, 2 Position), Suffix: Y (Yellow), Indicator: None

Number of Ports: 3 Port, Piping Direct., Plunger Length: 0 (Side Ported, Long), Body Option: Side Mounting, Port Size: N01 (NPT 1/8, Side Ported Only), Actuator Type: 30 (Push Botton, Mushroom), Suffix: Y (Yellow), Indicator: None, Bracket: B (w/Bracket)

Number of Ports: 2 Port, Piping Direct., Plunger Length: 0 (Side Ported, Long), Body Option: U (w/Bottom Mounting Thread), Port Size: N01 (NPT 1/8, Side Ported Only), Actuator Type: 30 (Push Botton, Mushroom), Suffix: Y (Yellow), Indicator: None

Number of Ports: 3 Port, Piping Direct., Plunger Length: 0 (Side Ported, Long), Body Option: U (w/Bottom Mounting Thread), Port Size: N01 (NPT 1/8, Side Ported Only), Actuator Type: 32 (Push Button, Extended), Suffix: Y (Yellow), Indicator: None

Number of Ports: 3 Port, Piping Direct., Plunger Length: 0 (Side Ported, Long), Body Option: Side Mounting, Port Size: N01 (NPT 1/8, Side Ported Only), Actuator Type: 32 (Push Button, Extended), Suffix: Y (Yellow), Indicator: None, Bracket: B (w/Bracket)

Controller Mounting: D (DIN Rail Mouting), Cable Length: 1 (1 m), Inlet Port Silencer: B (ANB1-01, 55 dB), Digital Pressure Switch: P (ISE20A-Y-01-J-X603)

type=GUIDE&id=ZSE20(F)-ISE20-E" target="_blank">here. And the ISE/ZSE20C series (for general purpose fluids) catalog can be found here.