The purpose of these couplers is to provide an interface between the different thread specifications of NPT pipe threading and BST pipe threading.
Most locally available 1-1/2" pipe in the US is threaded using the NPT standard and the threads of the ceiling mount base and the HDH 304 dome housing are BSP standard; therefore the D-CPLR coupler is threaded NPT on one end and BSP on the other end.
- Threaded coupler pair (2 pcs)
- Interface NPT thread to DH304 series threads
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