These are BSPP x JIC male male nipples . Bspp, is a 'parallel' thread, used for valve, cylinder ports etc. These come with either a 'dowdy' washer or encapsulated dowdy washer. No thread tape should be used when fitting. To buy multiple quantities, click 'add to bag’, & then keep clicking 'add to bag' numerous times. Alternately, click 'add to bag’, & then at check-out there is an easy option to add whatever quantities you require.