Threaded nipple, threaded plug, threaded cap, threaded socket, threaded elbow, threaded tee, threaded reducing bush. Available at Parklea Sand & Soil Australia.
General 

Plasson BSP Threaded Fittings

BSP_Nipple

Threaded Nipple

BSP_Plug

Threaded Plug

BSP_Cap

Threaded Cap

BSP_Socket

Threaded Socket

BSP_Elbow

Threaded Elbow

BSP_Tee

Threaded Tee

BSP_Reducing_Bush

Threaded Reducing Bush