The answer is in the name there are many MS polymer sealant/adhesives on the market with varying levels of quality resulting in performance. The next grade up is a Hybrid polymer with the same varying qualities and performances the Wickes Premium Hybrid...

Solder ring Fitting Reducer (Dia)15mm x 8mm.This fitting reducer from Plumbsure has a durable copper construction. It is fitted by heating until the solder runs around the joint by capillary action.

Lasts up to 50x longer than HCS hole saw in tough materialsCutting holes in brick, soft tiles and drywall is essential for plumbers and electricians on a building site or during renovation work. Few hole saws can withstand this kind of work...