"Frost protection"
I bought 2 to protect my 2 outside taps replacing some that I had had for approx 8 years (the originals were not bought from Lakeland but are exactly the same). That says it all. They are durable & you can still use the tap during the winter. I store mine in the shed over the summer, so they have lasted amazingly well in extreme temperatures. Most importantly they do the job. 1 of my taps is exposed to all weathers! Prevailing rain, snow & bright sun, so takes all extremes. The other doesn’t see daylight in the winter, it’s in a dark corner. They work excellently on both. Simple but brill.