I'm have no experience in plumbing so please don't bite
My builder suggested I upgrade my existing 15mm water connection to 25mm which has been done and fitted, however looking at the internal stopcock it receives at 25mm MDPE connection however drops back down to 15mm again and goes to wherever I'm not sure.
Can someone tell me why a 25mm x 15mm stopcock was used, doesn't this defy the purpose of the upgrade as my previous water connection was already 15mm.
My boiler is vaillant 837
My builder suggested I upgrade my existing 15mm water connection to 25mm which has been done and fitted, however looking at the internal stopcock it receives at 25mm MDPE connection however drops back down to 15mm again and goes to wherever I'm not sure.
Can someone tell me why a 25mm x 15mm stopcock was used, doesn't this defy the purpose of the upgrade as my previous water connection was already 15mm.
My boiler is vaillant 837