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20mm × 15mm reducing impact sprinkler coupling for connecting a sprinkler to a threaded riser. It provides room for the moving parts that extend below the sprinkler’s threaded inlet so the sprinkler can turn freely.
An ordinary coupling can obstruct the moving parts on some impact sprinklers, even when the thread size matches.
Where an arrow is marked, point it towards the sprinkler. Fit reducing couplings with the smaller end upwards towards the sprinkler.
Black reducing sprinkler coupling with female threaded ends