1) You can search by categories.

Using the left menu search down until you get to part required..

2) Search for single thread type and size:

Male BSP 1/8", search for m-bsp-1/8
Male BSP 1/4", search for m-bsp-1/4
Male BSP 3/8", search for m-bsp-3/8
Male BSP 1/2", search for m-bsp-1/2

Female BSP 1/8" , search for f-bsp-1/8
Female BSP 1/4", search for f-bsp-1/4
Female BSP 3/8", search for f-bsp-3/8
Female BSP 1/2", search for f-bsp-1/2

Male SAE 1/4" search for m-SAE-1/4
Male SAE 5/16" search for m-SAE-5/16
Male SAE 3/8"search for m-SAE-3/8

Female SAE 1/4" search for f-SAE-1/4
Female SAE 5/16"search for f-SAE-5/16
Female SAE 3/8"search for f-SAE-3/8

This search will list all fittings with at least one matching thread.

3) Search for two thread types and size:

Eg. To find a joiner for Male BSP 1/4" to Male SAE 5/16

search for m-sae-5/16 m-bsp-1/4

NOTE: each thread has NO spaces, but there MUST be a space separating the first and second thread in the search string.

This search will list all fittings which match both threads.

4) Using the 'Joins' image located on many appliances and fittings.

Clicking the image should show the fittings that will connect to the currently displayed item. Following from one part to the next should allow you to purchase compatible parts to achieve a complete gas system from bottle to appliances.