HEAVY DUTY 26 AMP PRESSURE SWITCH THIS IS A BRAND NEW PRESSURE SWITCH 140-175 PSI. FOUR PORT 1/4" CONNECTION TYPE. THIS SWITCH REPLACES FURNAS... SQUARE D ... AND MOST OTHER PRESSURE SWITCH MANUFACTURERS. THIS SWITCH COMES WITH AN UNLOADER & ON/OFF SWITCH LOCATED ON THE FRONT COVER. THE UNLOADER LINE WILL HANDLE 1/4" COPPER OR NYLON TUBING. SIMPLY PUSH THE COPPER/NYLON TUBING INTO THE UNLOADER PORT TO LOCK IN PLACE FOR A TIGHT SEAL. WHY GO WITH A HEAVY DUTY PRESSURE SWITCH, RATHER THAN A STANDARD SWITCH?? THE REASON ARE THE PRESSURE SWITCH CONTACTS. GENERALLY SPEAKING, THE FIRST THING THAT BECOMES FAULTY ON PRESSURE SWITCHES THESE DAYS, ARE THE CONTACT POINTS WHERE YOUR MOTOR/STARTER CONNECTS. OVERTIME AND OVERUSE, THE CONTACTS BEGIN TO MELT TOGETHER, SOON AFTER SHORTING OUT THE PRESSURE SWITCH. BY GOING WITH A HEAVY DUTY PRESSURE SWITCH WITH A LARGER AMP RATING, THE CONTACTS ON THE SWITCH ARE DESIGNED TO HANDLE HIGHER AMP LOADS, THEREFORE ALLOWING THE CONTACTS TO LAST LONGER, WHICH IN TURN ALLOWS YOU PRESSURE SWITCH TO FUNCTION PROPERLY AND LAST A VERY LONG TIME. PRESSURE: 140-175 PRESSURE SETTINGS ARE ADJUSTABLE. MAX PRESSURE: 200 PSI MIN ON: 70 PSI DIFFERENTIAL: 35-55 PSI PORT: 4 PORTS 1/4" (FEMALE NPT) POLE: 2 POLE RATING AMP RATING: 26 AMPS SINGLE PHASE OR THREE PHASE, 110/230/460 UNLOADER: 90 DEGREE ANGEL UNLOADER