Four-way coupling 3x internal BSP thread, 1x external BSPT thread type A20, intended for connecting pneumatic components (including hoses) together. The tightness of the connection usually requires the use of additional seals. In the case of tapered threads, Teflon tape or sealant is needed; for cylindrical threads, aluminum or copper washers are required. Material: nickel-plated brass. Working pressure: 60 bar.