Are all MDPE stopcocks like this?

[cjard]

I've picked up a few MDPE stop taps but I'm not sure whether the mechanism will cause a flow restriction..

Here's a stylised 3d drawing of what I have (click for bigger):



and some photos of the device itself, down the ports..








My concern is chiefly that a 32mm stopcock has a valve arrangement where the water flows through a hole approx 15mm diameter. While it wouldnt have the friction of a length of 15mm pipe, I can't help but think that it's not much different to those flow restrictor washers one fits to shower hoses.. What's the point of having a large water pipe if everything is going to have to come through a tiny hole? Should I send them back and look for a 32mm ball valve or am I worrying over nothing and in the grand scheme of things it will make nearly no difference to pressure and flow rates?

 

[copea]

I thought the same when I installed a 25mm version. The reality is that it's absolutely fine - I seem to remember it was passing around 35lpm off a 3/4" galvanized iron main (open end), so you'll be fine with a 32mm stopcock.