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| 887 Challenger Series
www.natvac.com | 800.253.5500
1. Procure a flange to mount on your four-way valve, a short 4” pipe
nipple, a 4” pipe cap and a vacuum gage.
2. Drill and tap a 1/4” N.P.T. thread in the pipe cap.
3. Assemble the flange, nipple, pipe cap and vacuum gage.
4. Remove a flange from the four-way valve on your pump.
5. Start the pump and confirm the location you have chosen to test from
is at vacuum.
6. Using the existing O-ring, fasten the testing flange to your pump.
7. Start your pump and read the vacuum level on the gauge.
Making a Vacuum Tester _______________________________________