A <a href="https://en.wikipedia.org/wiki/compression_fitting" class="extiw" title="en:compression fitting">compression fitting</a> isolating <a href="https://en.wikipedia.org/wiki/valve" class="extiw" title="en:valve">valve</a>, 15mm pipe diameter, screwdriver turn. Isolating valves are typically put before spurs, <a href="https://en.wikipedia.org/wiki/tap" class="extiw" title="en:tap">taps</a> and suchlike. They make maintenance easier by removing the need to turn off and drain the plumbing system before work is carried out.
<div class="description mw-content-ltr de" dir="ltr" lang="de"><span class="language de" title="German"><b>Deutsch: </b></span> <a href="https://de.wikipedia.org/wiki/Klemmringverschraubung" class="extiw" title="de:Klemmringverschraubung">Klemmringverschraubung</a></div>
<div class="description mw-content-ltr fr" dir="ltr" lang="fr"><span class="language fr" title="French"><b>Français : </b></span> <a href="https://fr.wikipedia.org/wiki/Raccord_(robinetterie)" class="extiw" title="fr:Raccord (robinetterie)">Raccords à compression</a></div>
<div class="description mw-content-ltr nl" dir="ltr" lang="nl"><span class="language nl" title="Dutch"><b>Nederlands: </b></span> <a href="https://nl.wikipedia.org/wiki/Knelkoppeling" class="extiw" title="nl:Knelkoppeling">Knelkoppelingen</a> voor 15 mm pijp, met afsluitklep (zodat er  bij onderhoud gewerkt kan worden zonder de hoofdkraan af te sluiten.)</div>
<a href="//commons.wikimedia.org/wiki/User:Mike1024" title="User:Mike1024">Mike1024</a>
2007-03-01
<span class="int-own-work" lang="en">Own work</span>