PRODUCT DETAILS Brand-new, genuine Homelite/Ryobi primer bulb, part# 561635001 Compatible with many Homelite & Ryobi blower vacs, edgers, & string trimmers Dimensions: OAD: 0.715″ 18.18 mm (w/o flange), 0.833″ 21.18 mm (w/ flange) Overall height: 0.691″ 17.57 mm Compatible with: UT-60526 Tiller/Cultivator, UT22600, UT22650, UT09510 2 Cycle, UT32600, UT32650, UT09521, UT09520, UT09523, UT09525, UT32000s, UT32050s, UT32601As, UT32651As, UT32605As, UT32655As, UT32605s, UT32655s, UT32601, Ryobi, RY09550, RY09551, RY28000, RY28020 (CS26), RY28040 (SS26), SS30 (RY30002), BC30 (RY30004), CS30 (RY26500), CS30 (RY30000A), SS30 (RY30002A), RY26540, BC30 (RY30160), RY09050/Vac, RY13010 4 Cycle Wheeled, RY13050 4 Cycle Wheeled Edger, RY13050A 4 Cycle Wheeled Edger, RY64400 4 Cycle Cultivator, RY09053 2 Cycle, RY09800 2-Cycle , RY28021, RY28041, RY28005, RY28025, RY28045, RY13015 30cc 4-Cycle Wheeled, RY09055/Vacuum, RY09056/Vac