Poulan Crankcase Gasket part# 019044 supersedes to part# 530-019044. Following is a list of chainsaw models that use this gasket between the crankcase halves; S25AV, S25DA, and S25. There may be models that use this part that we do not have listed here. Please refer to your owners manual or a parts breakdown for your model, to assure that this is the correct part for your machine, before you order.