Plastic Valve - Stops the air which you are blowing in from returning back up the blow stick. This is the crucial part as without this sealing properly, it's going to be a struggle. Air will leak and not even reach the bag -so valve and bag being airtight are the first two items to get right before you do anything else.

These details about Plastic Valve, were supplied (along with details of 114 other products from Begg Bagpipes.com) on 22-Mar-2010.