Switzer Products Smart Solutions for Precision Control. Differential Pressure Switch 301, 303, 304, 381 and 384 Differential Pressure Switch 306 and 386 Differential Pressure Switch 310 Differential Pressure Switch DPS 301, DPS 303, DPS 361 and DPS 363 Electronic Pressure Switch 711 Pressure Switch 021 and 023 Pressure Switch 201, 203 and 281 Pressure Switch 204 and 208 Pressure Switch PS 01 Pressure Switch PS 601 and PS 602 Pressure Switch PS 901, PS 902 and PS 903 Pressure Switch S21 Pressure Switch GR 201