For those situations where you need an RJ31X plug on the end of a four-conductor 'quad' wire. Faster, easier, and more reliable than crimping a modular plug onto the quad wire.
You can now use the new BW-8 Adapter to quickly plug the phone line into panels that have on-board RJ-31-X female jacks. This item is very useful in connecting phone line inputs to Fire Control panels, many burglary panels, and accessory modules.
The BW-8 has the patented BW terminal block on one end, and the standard 8 pin RJ-31-X style male plug on the other end.