To strengthen flue pipe connections use short metal to metal self tappers, available in our Useful Items collection
As with all vitreous pipe the bottom end narrows to a lesser diameter to enable insertion into other pieces of pipe (male is always on top). Key reason is that any condensation that trickles down inside pipe cannot escape. Straight lengths can be cut using a grinder and 115mm cutting disc (available from this online store).
Second time we have used this website and recieved excellent service again. Love the stoves and the ease of using the website to work out how to install it.