What's the difference between STS15 (black o rings) and STS15P (blue o rings) inserts (15mm in this case)
Both are superseal and everyone seems to be selling both but the John Guest web site doesn't have the STS15P listed, im guessing the STS15P (blue O ring) is new.
So what's the 'P' stand for : STS15P
Both are superseal and everyone seems to be selling both but the John Guest web site doesn't have the STS15P listed, im guessing the STS15P (blue O ring) is new.
So what's the 'P' stand for : STS15P