NIMTEK New Zama CARBURETOR Carb RB-K90 fits Echo PB-251 PB-255 PB-255LN ES-255 Blowers Brand New High Quality Aftermarket Carburetor Replaces Part Number: A021001590, A021001591, A021001592, A021001593. Replace Zama RB-K90. Fits Echo PB-251 ES-255 PB-255LN PB-255 ES-255 Blowers. Fast and Direct shipping from US warehouse.