Detail:*Primer Bulb is a great replacement for Homelite/Poulan/Sears/Craftsman chainsaws, blower, trimmer*Fits model: 791-683974-B, 615-764, UP04033, 300780001, 300780002, 300780004*Replaces part number: 188-512,188-512-1, 683974, 530047721,503 83 66-01*Replaces Walbro part number: WT-23A, WYJ-33, WYJ-34, WYJ-45, WYJ-92, WYJ-94, WYJ-86*Non-original part, direct fit.*Please check the pictures, models and part number carefully for compatibility before ordering.*Item Condition:100% Brand New*Color: As Pictures ShowFits engine models(for reference):For Echo 350, 370, 420 and Tanaka 3350MB1000 Pressure Washer UT-01596-- Housing, Pump & Tank MB1000 Pressure Washer UT-01596-1-- Housing, Pump & Tank 20 Chain Saw UT-10847-- Engine Housing - Fuel Tank - Oil Tank 20 Chain Saw UT-10881-- Engine Housing - Fuel Tank - Oil Tank 20 w/cc Chain Saw UT-10853-- Engine Housing - Fuel Tank - Oil Tank 20 w/cc Chain Saw UT-10883-- Engine Housing - Fuel Tank - Oil Tank 23 w/cc Chain Saw UT-10870-- Engine Housing - Fuel Tank - Oil Tank 33 UT-26204-- Engine Housing - Fuel Tank - Oil Tank 38 UT-26205-- Engine Housing - Fuel Tank - Oil Tank B2216CC Chain Saw UT-10941-- Engine Housing - Fuel Tank - Oil Tank d3300 Chain Saw UT-10855-- Engine Housing - Fuel Tank - Oil Tank d3300 Chain Saw UT-10880-- Engine Housing - Fuel Tank - Oil Tank d3300c Chain Saw UT-10857-- Engine Housing - Fuel Tank - Oil Tank d3300c Chain Saw UT-10882-- Engine Housing - Fuel Tank - Oil Tank i4550b Chain Saw UT-10862-- Engine Housing - Fuel Tank - Oil Tank PS33 Chain Saw UT-10854-- Engine Housing - Fuel Tank - Oil Tank For Ranger 33cc 16" Chain Saw UT-10926-- Engine Housing - Fuel Tank - Oil Tank 1940 UT-26030-- Starter 1940 UT-26030-A-- Starter 33 cc 14" Chain Saw UT-10901-B-- Engine Housing- Fuel Tank- Oil Tank 250 Chain Saw UT-10724-B-- Engine Housing 250 Chain Saw UT-10724-C-- Engine Housing 250 Chain Saw UT-10724-D-- Engine Housing 250 Chain Saw UT-10724-E-- Engine Housing 252 Chain Saw UT-10732-- En