This heavy duty Type A drain off cock is robost and has a much better life and reliability than the cheaper Type B.
An extra seal on the spindle and a stronger sealing washer in comparison to Type B mean you can fit it and forget it for years without worrying over whether it will work when you eventually need to drain off water."
"the type A drain cock has a seal inside so when you loosen it to drain, water only comes out of the tap. the cheaper type B leaks from the top ( not ideal if your draining a c/h system with carpets!) don't forget to remove the top before soldering."
"These drain cocks have a higher flow rate than the previous type, so it's easier to get all the water out of the CH system. No probs soldering in (though I found it helps to put the seal back in before filling the system!) and they don't need painting."
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Review 10 for Drain Cock Type A Heavy Pattern 15mm
"These used to be ideal. However the last batch I bought no longer have an 'O' ring on the large knurled nut and will therefore leak like type B when draining. Maybe plenty of PTFE on the thread will work. Have not tested yet."