these washers have a 1ish week lead time do to needing to be machined from a large chunk of PTFE that is on order. Also the 5 washers have recently been converted to 3 thicker washers to improve longevity
These custom made PTFE washers are designed to go on the front stem or the instantvap to allow you to treat through the front door of your hive. All 5 washers go on the stem at one time as you can see in our YouTube video.
being that this is a chemically inert material and fairly high temp resistant we believe these should last many seasons before replacement.
if they come loose simply apply a little propolis to the stem of the unit when hot, they will stay very firm in place.