I'm about to add a feed to a new sink which involves a fairly long run of pipe. I'm going to use 15mm plastic and Speedfit fittings as I have used them before and like them.
However I want a few valves to allow me to isolate the new run (that means a valve in the loft) and to isolate the sink tap (which means a valve under the sink). The Speedfit valves seem horribly expensive compared with all the other Speedfit stuff so I'm wondering about alternatives.
So, firstly, can I use ordinary 15mm compression fittings on the Speedfit pipe, I'm fairly sure the answer is yes but I'd like to be sure.
If I can use ordinary fittings then which of the following would be best:-