My Account | My Garage | Commercial/Dealer Login | Order Status |
Contact Customer Support
M-F: 9am-6pm ET
Sat: 9am-5pm ET
| 1-877-737-2787
Shopping Cart

Over 1,000,000 Orders Shipped Since 1997!

3777 4.5" HG X 1/4" FPT Vacuum Switch

Barens 3777 4.5" HG X 1/4" FPT Vacuum Switch

Part#:  3777
There are no reviews at this time.
Barens OEM Part



4.5" HG X 1/4" FPT Vacuum Switch

Fits Model


Also Fits Model


Replaces OEM



Temperature 140°F
Inlet 1/4" FPT
Vacuum switches are installed on the inlet line to the pump. They are composed of two parts, the diaphragm, which responds to changes in system pressure, expanding toward its system side when pressure in the system falls below outside or atmospheric pressure, and the electrical switch which is held open by spring tension when there is no pressure differential and the diaphragm is in its normal position.
When the pump draws water into the system, the suction causes pressure on the inlet side of the pump to decrease, the diaphragm falls and the vacuum switch contacts close, completing the circuit to the burner system. When flow ceases, the diaphragm rises and a spring helps return the switch to the open position. With the switch open, the circuit to the burner system is broken, the solenoid valve closes, and fuel flow to the burner ceases, stopping burner firing.
NOTE: A potential problem with a vac switch can be created when the inlet filter or float tank becomes clogged. The pump will continue to run, creating a pressure drop on the inlet. When this happens, the vac switch will continue to close and start the burner.
Should be used on Gas engine pressure washers and electric over 4.5 GPM
Equivalent to 0017 vac switch
Gallons Per Minute 4.5
Weight 1.2 lbs
Equipment Type Pressure Washer

Customer Reviews for the 4.5" HG X 1/4" FPT Vacuum Switch

There are no reviews for this product at the time.

Questions & Answers for the Barens 3777

Ask us about the Barens 3777 4.5" HG X 1/4" FPT Vacuum Switch. Please no repair questions. Your Q&A may be posted to to help other shoppers, like you, with their purchasing decisions. Thank you.

Repair Tips For Barens 3777

No repair tips at this time.

back to top