This repair kit is what we use to rebuild the 23120 regulator by TeeJet. If your system will not come up to pressure, often the problem is that the seats or o-rings in the relief valve are worn and are allowing all your volume to return to your tank, instead of creating pressure out of your nozzle.
This Kit differs from the PKAB23120-KIT or PKAB23120A-Kit in that it does not include the spring and does include the plastic seats. The spring in the 23120 regulator is very heavy and not prone to wear. The two seats, however, are integral in maintaining proper pressure on your sprayer.
This is the Kit that is included in the WM Start-up kits for both Gas and Electric lawn care units.
This kit includes the Viton o-ring for the best chemical resistance.