Features REPLACEMENT PARTS: These primer bulbs can replace the hardened or cracked primer bulb on the chainsaw, allowing fuel to be correctly sucked into the carburetor. APPLICABLE MODEL: The primer bulb is suitable for Hus.qvarna, for Po.ulan, for Po.ulan, and for ST.HIL machine model, is perfect replacement for 188‑512, 188‑512‑1. PLASTIC MATERIAL: These primer bulbs are made of excellent plastic and rubber, with good toughness, impact resistance, wear resistance, and long service life. COMPACT SIZE: These electric saw bulbs have compact size, and can be directly replaced with old or damaged ones, with strong compatibility. 6PCS IN 1 SET: Includes 6pcs primer bulbs, used for 2 stroke small engines, ensuring optimal performance of the electric saw, simple and practical. Specification: Item Type: Primer Bulb Material: Plastic Applicable Model:  For 188-512, 188-512-1 For Hus.qvarna 530047721 For RY.OBI UP04033 300780004 300780001 For Po.ulan 35879158 35879558 35879898 3587952 35879556 35879516 3587958 For ST.HIL FS36 FS40 FS44 FS44R Trimmer For PP136 PP136E PP330 Chainsaw For CS300 CS301 CS305 CS306 CS340 CS341 CS345 CS346 CS3000 CS3400 CS3450 CS271T CS303T CS310 CS352 CS353ES CS355T CS360TES CS361P CS370 CS370F CS400 CS400F CS420ES CS450 CS450P Chainsaw For Po.ulan PP445 PP446 PP446E PP446ET PP446T SM446E Trimming Saw For Ry.obi BP42 RY08420 RY08420A RY42BPEMC RY42WB Blower For Ry.obi 600r 700r 700rVP 704r 704rVP 705r 720r 725r 725rE 750r 765r 766r 767r 770rEB 775r 790r Trimmer For Hu.sqvarna 123L 125B 125BVX 125BX 225 225BX 225HBV 227L 227LD 227R 227RD 232L 235 235E 236 236E 240 240E 240L 322C 322L 322R 323 325CX 325LX 325LX 325LXT 325RDX 325RJX 325RX 325RXT 326 326C 326L 326LX 334T 338XPT 340 340E 345 346XP 350 350EPA 353 356BF 356BT 435 435E 440E 445 445E 450E 455 455E 460 Chainsaw Package List: 6 x Primer Bulb Package List 6 x Primer Bulb