The RM range of brass fittings are suitable for pneumatic air line systems. Suitable for plastic and soft metal pipe. The Straight Male Adaptor, available in 4mm to 12mm sizes, also have SuperThread, a unique thread seal developed by John Guest, to enable male adaptors to be used with a variety of female thread forms. The RM brass fittings with the SuperThread can be used with BSP (Parallel), BSPT (Taper), NPTF, PF and PT metal thread forms. The special polyurethane seal feature, means no sealant is needed to make an airtight joint. There is no danger of tape entering the system.