https://www.vetnurse.co.uk/f/clinical-discussions/18926/apl-on-t-piece Hi, We&#39;ve recieved a T-piece with an APL valve attached which is the first time I&#39;ve encountered this. Does anybody know if this addition causes resistance within the circuit and if there is a minimum weight limit associated with its use? I alwaysen-USTelligent Community 10https://www.vetnurse.co.uk/thread/135251?ContentTypeID=1Fri, 05 Oct 2012 10:11:37 GMT1a0763ec-3885-442c-853e-6cef656dfec5:b27966b7-3b9a-417d-ae26-4061460b53efjules007<p>great, thank you - this is exactly what I needed to know !</p><div style="clear:both;"></div>https://www.vetnurse.co.uk/thread/135250?ContentTypeID=1Fri, 05 Oct 2012 09:39:50 GMT1a0763ec-3885-442c-853e-6cef656dfec5:7b341b31-b5cd-4b3f-8775-895f6abcdcb6emvn80<p>you are right to question it as adding valves will increase resistance, however don&#39;t worry, these are specially designed low resistance valves and also normally have a safety pressure release valve to allow gas to escape out of the APL valve even if it is left closed when the pressure exceeds a set limit.</p> <p>It still has a circuit factor of 2.5 and functions in the same way, on exactly the same size small furries as you have been using your t-pieces but IPPV is easier.</p> <p>Hope this helps</p><div style="clear:both;"></div>