Graco 235998, 600 PSI Thermal Relief Kit For Series C, Fire-Ball 225, 3:1 and 1/4:1 Dyna-Star Oil Pumps Vent Caps so you know it is

so you know it is replaced instead of re-assembled

Overall Height (mm)    146

and biodiesel blends up to B20

Maximum Operating Pressure: 100 PSI

Graco 235998, 600 PSI Thermal Relief Kit For Series C, Fire-Ball 225, 3:1 and 1/4:1 Dyna-Star Oil Pumps Vent Caps so you know it isDesigned for Series C, Fire Ball 225, 3: 1 and 1 4: 1 Dyna Star pumps Maximum Fluid Relief Pressure psi: 600psi Thermal expansion of fluid in the outlet line can cause over pressurization. This can occur when using hard plumbed fluid lines exposed to sunlight or ambient heat, or when plumbing from a cool to a warm area (for example, from an underground tank to a fluid lines along the ceiling). In a properly functioning pressure relieved system, when