Straight adaptors are used to convert the thread size of 1/4 BSP hose fittings in order to enable them to be connected to 3/8 BSP HD shank fittings. They consist of A 1/4 BSP threaded male nipple passed through a 3/8 BSP female nut The adaptors are available in Left Hand LH and Right Hand RH versions For fuel gases and inert gases respectively.