K21
* K21 | Unilateral. The valve is rotated trough 90 degree only in one of hundred
ðîí (on or counter clockwise). On plastic insertion from some
party arrow, on the other - the prohibition mark is depicted in.
| K22
* K22 | Double-sided. The valve is rotated trough 90 degree in two party.
on plastic insertion on both sides is depicted in arrow.
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