How do I perform the Pressure Relief Procedure on the XP Proportioner?

Engage the gun trigger lock, then close the main air shutoff valve (MA) for XP Proportioners or set the pump valve off for XP-h Proportioners. Remove the spray tip, disengage the trigger lock, and hold a metal part of the gun firmly to a grounded metal pail and trigger the gun to relieve pressure. Then close the dual shutoff handle (FE) and open the circulation handle (FC) to relieve A and B fluid pressure. Always flush the mix hose after relieving A and B fluid pressure through the mix manifold. (Page 29)