While this AR42118 comes completely assembled.  Here is a list of parts you will find all included for you:

• Part number AR2760400 the Piston, quantity of one.
• AR2260100 an O-Ring in a quantity of one.
• One O-ring with a part number of AR660190.
• The ring AR2760210, quantity of one.
• A piston guide part numbered AR2840750.
• Four o-rings with a number of AR740290.
• O-ring number AR820510 times one.
• A By-Pass Jet that is number AR2840760, quantity of one.
• One seat numbered AR2840770.
• Another o-ring numbered AR1470210.
• A nut with a part number of AR1980300.
• Grub screw AR392840 times 1.
• The handle insert part number AR2760480.
• Two plate springs numbered AR1980220.
• One spring with a number of AR2760410.