Includes (4) Box Throttle Spring UP03210.This part replaces obsolete part : PS01718.Genuine Homelite Replacement Part.New Bulk Packaged.Please refer to list below for compatibility.Compatible with: Ryobi: CS30 (RY30000) 30cc , CS30 (RY30000A) 30cc , RY30000B 30cc , SS30 (RY30002) 30cc , SS30 (RY30002A) 30cc , RY30002B 30cc , BC30 (RY30004) 30cc Brushcutter, BC30 (RY30004A) 30cc Brushcutter, RY30004B 30cc Brushcutter, RY30004D 30cc Brushcutter, RY30020 30cc Curved Shaft , RY30020A 30cc , CS30 (RY30021A) 30cc , RY30023 30cc Curved Shaft , SS30 (RY30040) 30cc Straight Shaft , RY30040A 30cc , RY30040B 30cc , SS30 (RY30041A) 30cc , SS30 (RY30043) 30cc Straight Shaft , RY30060A 30cc Brushcutter, RY30060B 30cc Brushcutter, BC30 (RY30061A) 30cc Brushcutter, RY30063 30cc Brushcutter, RY52001 Pruner /, RY52001A Pruner /, RY52002 Pruner /, RY52002A Pruner /, RY52003 Gas Pruner, RY52003A Gas Pruner, RY52004 30cc Gas Pruner, RY52004A Gas Pruner, RY70101 Curved Shaft, RY70101A Curved Shaft, RY70103 Curved Shaft, RY70103A Curved Shaft, RY70105 Straight Shaft, RY70105A Straight Shaft, RY70111 Curved Shaft, RY70113 Curved Split Shaft, RY30020B 30cc , RY30060 30cc Brushcutter, RY30544 30cc , RY30140 30cc , RY30524 30cc , RY30120 30cc , RY30240 30cc , RY52014 TP30 Gas Pruner, RY30562 30cc , RY30522 30cc , Homelite, B25C (UT-20768), B25C (UT-20770), B25S (UT-15182), BC800 (UT-15184), BC800 (UT-15184), BC900 (UT-15166), BC900 (UT-15172), C300 (UT-20755), C300 (UT-20775), UT20695 (D725CDE), UT20713 (D725CDE), D725CDE (UT-20773), UT20711 (D825CA), D825CA (UT-20736), UT20705 (D825CDP), UT15152 (D825SB), UT15160 (D825SB), UT15165 (D825SB), UT15170 (D825SB), UT20700 (D825SD), UT20701 (D825SD), UT20709 (D825SD), D825SD (UT-20729), D825SD (UT-20774), D825SD (UT-20784), UT-20703, UT-20704, UT-20730, UT-20737, UT-20738, UT-20832, UT-20837, UT-20699, UT-20693, UT-20780 Easy Trim , UT-20712 Expand-It 3 in 1 , UT-20710 Expand-it Plus , UT-20735 Expand-it String : F2020 (UT-20788) , F2020 (UT-20789) , F2040 (UT-20791) , F3040 (UT-15176) , F3050 (UT-15179) , BC2500AZ (UT-15205), BC2500AZ (UT-15201), BC2500AZ (UT-15202), UT15204 (BC2500MR), UT15159R (BC2500MR), UT15200 (BC2500R), UT20694 (Trim N' Edge) Zip Start, UT20697 (Trim N' Edge) Zip Start, UT20698 (Trim N' Edge) Zip Start, UT20702 (Trim N' Edge) Zip Start, UT20707 (Trim N' Edge) Zip Start, UT20728 (Trim N' Edge) Zip Start, UT15151 (Versa Tool) Zip Start : UT15154 (Versa Tool) Zip Start, UT15157 (Versa Tool) Zip Start, UT20722 (Versa Tool) Zip Start, UT20723 (Versa Tool) Zip Start, UT20726R (ST2517CR) Zip Start, UT20823 (ST2517CR) Zip Start, UT20734R (ST2537S) Zip Start, UT20827 (ST2537S) Zip Start, UT20763 (D825SD) Zip Start, UT20817 (ST2517CR) Zip Start, UT20818 (ST2537S) Zip Start, UT15180 (K400) Zip Start, UT15181 (K400) Zip Start, UT15169 (Versa Tool) Zip Start, UT20811 (Versa Tool) Zip Start, UT20811A (Versa Tool) Zip Start, UT20811B (Versa Tool) Zip Start, UT