Function D105 - 1:1.05 ratio
A model N cover is used with a D105 insert (1:1.05 area ratio) which can be supplied with an orifice in the poppet. This configuration is used to open A to B or block A to B. D105 poppets cannot be used for flow from B to A. The orifice avoids the need to machine a connecting hole in the manifold to port A. To obtain a D105 insert with an orifice in the poppet (i.e. D105V), the orifice size must be specified at the end of the insert model number.