The fittings are intended for Webasto, Eberspacher, Planar, Chinese and other diesel heaters (or other units on gasoline, diesel fuel, LPG) installed in sheds, garages, workshops, cabins, etc.
You should choose a size not less than the wall thickness.
The unit is in perfect shape. The construction of the fitting is great (very robust and the welds look perfect) and the package included a gasket and mounting screws. For this installation, we didn't use the screws because we drilled the hull and bolted the fitting down. Everything works very well - this is a great fitting
our amazon buyer