Connect 16 mm LDPE drip supply pipe to 3/4" BSP parallel (G3/4 / BSPP)
How to join 16 mm (0.63" OD) and G3/4, and what stops it leaking.
Not a direct fit. Joining 16 mm LDPE drip supply pipe to 3/4" BSP parallel (G3/4 / BSPP) needs a 16 mm drip pipe to 3/4 BSP tap adapter.
The part to buy
A garden drip system on 16 mm pipe reaches a 3/4 BSP outdoor tap through a threaded drip take-off: a 3/4 BSP female that seals on the tap washer and presents a 16 mm barb or push-fit for the pipe. This is the normal way to start a drip run from a tap.
Fit a pressure reducer and a filter at the tap. Mains pressure will blow 16 mm fittings off and grit clogs the drippers; the BSP take-off is only the first part of the join.
Related connections
Sources: Drip fitting sizing and tubing compatibility, DripWorks · Barbed drip fitting sizing by tubing inner diameter, GardeningAsk · ISO 228-1 (G / BSPP parallel pipe threads) · BSP thread dimensions chart (ISO 228 / ISO 7), AmesWeb · Washing-machine / dishwasher inlet 3/4 BSP connector data