4 X Gas Primer Bulbs Pump Screws assembly Fit For PB-1000 or PB-1010 series Echo Gas Blowers .7"/18mm OD x .575"/14.6mm HT This is zama primer bulb for CIQ & C1U series carburetors PART LOCATION =BIN # 0057004. Installation: Easy installation, No Installation Instruction Package include: 4 X Primer Bulbs Pump