To relieve pressure you turn the sprayer off or turn off air being supplied to the airless sprayer

AED-23315-120HM 230V

the replacement is part # 8-0667

Exclusive ProStart Engine Starting System - Up to 50% less pulling effort to start the engine (patent pending)

which is suitable for spraying a variety of materials

Cox Hose Reels -1600 Series - Motorized - 24V DC 1/3HP Reversible (1660 Model) - 28" Length PTFE Overmolded Diaph To relieve pressure you turnCOXREELS 1600 Series features the most versatile symmetric reel design in the market today. This feature rich reel series features nearly endless component configurations on a robust platform for any conceivable application. Targeted for the tough demands of customers requiring various dimensional choices, the series offers flexible size envelopes for any given hose capacity. The 1600 series hybrid frame offers unique accessories and upgrades which