- Corrosion resistant covers
- Easy to adjust
- UL/CSA listed
| PSI On/Off | Description | Part # |
| 95-125 | no unloader | PSL1 |
| 95-125 | w/unloader | PSL1X |
| 95-125 | w/unloader & on/off | PSL1MIX |
| 95-125 | w/unloader & on/off w/four way | PSL4MIX |
| 145-175 | no unloader | PSH1 |
| 145-175 | w/unloader | PSH1X |
| 145-175 | w/unloader & on/off | PSH1MIX |
| 145-175 | w/unloader & on/off w/four way | PSH4MIX |
| 15-230 | no unloader & adjustable differential | PSAD15- 230 |
| Pressure Switch Unloader Valve | PSUV |