Connect Caravan onboard 3/4 BSP water fitting to Garden Hose Thread (GHT / NH)
How to join 3/4" BSP onboard and 3/4"-11.5NH, and what stops it leaking.
Not a direct fit. Joining Caravan onboard 3/4 BSP water fitting to Garden Hose Thread (GHT / NH) needs a caravan 3/4 BSP to garden hose (GHT) adapter.
The part to buy
To fill a caravan from a US or imported GHT garden hose, a 3/4 BSP to GHT adapter joins the van inlet thread to the hose thread. The BSP end seals on a washer at the van; the GHT end seals on the hose coupling washer. Confirm the hose is GHT and not BSP first.
GHT and 3/4 BSP are both called 3/4 inch but run different pitches, 11.5 versus 14 TPI. Do not force a GHT hose onto a BSP van inlet; use the adapter.
Related connections
Sources: Caravan water supply fittings, BSP thread sizes, Leisureshopdirect · Whale Watermaster caravan mains water connector (fits Watermaster + Truma Ultraflow) · ASME B1.20.7 (garden hose / GHT / NH threads) · NPSH / NH / NHR hose coupling thread table, Fittings.space