Graco Endurance Pump Lower, GMax II 5900 air-flow-technology The head of the extension

The head of the extension is a fixed forward spray

For operating pressures above 1000 psi short end of spring seat goes into spring

and certified for use at pressures up to 150 psi by American Society of Mechanical Engineers (ASME)

Heavy duty 14 gauge welded steel construction

Graco Endurance Pump Lower, GMax II 5900 air-flow-technology The head of the extension287513 Graco Endurance Pump Lower, GMax II 5900 Standard and Premium. Graco Genuine OEM part 287513 Endurance Pump Lower. Fits: Graco UltraMax II 1095, UltraMax II 1595 & GMax II 5900 Standard and Premium Sprayers. Always check your owners manual for required part number. Fits: Graco UltraMax II 1095 UltraMax II 1595 GMax II 5900 Standard GMax II 5900 Premium Sprayers.