A filter head for a compressed air filter, the filter head comprising: a main body, the main body including an inlet port, an adaptor connector, a first inlet channel in fluid communication between the inlet port and the adaptor connector, a filter body connector, an outlet port, and an outlet channel in fluid communication between the filter body connector and the outlet port; and an adaptor having a main body connector, a filter element connector, and a second inlet channel in fluid communication between the main body connector and the filter element connector, the main body connector is adapted for coupling to the adaptor connector of the main body, whereby the first and second inlet channels form a continuous inlet channel between the inlet port and the filter element connector; wherein the filter element connector includes a first cylindrical collar which forms a first filter element port for receiving a collar of a filter element therewithin and the first cylindrical collar extends downwards from the filter head and includes an inner cylindrical wall and a lower annular edge, a first abutment or stop is provided at an upper end of the inner cylindrical wall and the first cylindrical collar includes an outside diameter, an inside diameter, and a length between the first abutment or stop and the lower annular edge; wherein the filter body connector includes a second cylindrical collar having an inside diameter which is larger than the outside diameter of the first cylindrical collar such that an annularly shaped second filter element port is formed between the first cylindrical collar and the second cylindrical collar, wherein the second cylindrical collar includes an internal wall having a thread; wherein the adaptor connector comprises a wall which includes an opening that forms part of the first inlet channel, the wall is bordered at one end by a rim and at the other end by an end wall; wherein the rim and the adaptor include respective mating surfaces, wherein the mating surfaces are inclined with respect to an orthogonal axis extending through the filter head, and the first inlet channel and second inlet channel define an elliptical shape adjacent the respective mating surfaces. a main body, the main body including an inlet port, an adaptor connector, a first inlet channel in fluid communication between the inlet port and the adaptor connector, a filter body connector, an outlet port, and an outlet channel in fluid communication between the filter body connector and the outlet port; and an adaptor having a main body connector, a filter element connector, and a second inlet channel in fluid communication between the main body connector and the filter element connector, the main body connector is adapted for coupling to the adaptor connector of the main body, whereby the first and second inlet channels form a continuous inlet channel between the inlet port and the filter element connector; wherein the filter element connector includes a first cylindrical collar which forms a first filter element port for receiving a collar of a filter element therewithin and the first cylindrical collar extends downwards from the filter head and includes an inner cylindrical wall and a lower annular edge, a first abutment or stop is provided at an upper end of the inner cylindrical wall and the first cylindrical collar includes an outside diameter, an inside diameter, and a length between the first abutment or stop and the lower annular edge; wherein the filter body connector includes a second cylindrical collar having an inside diameter which is larger than the outside diameter of the first cylindrical collar such that an annularly shaped second filter element port is formed between the first cylindrical collar and the second cylindrical collar, wherein the second cylindrical collar includes an internal wall having a thread; wherein the adaptor connector comprises a wall which includes an opening that forms part of the first inlet channel, the wall is bordered at one end by a rim and at the other end by an end wall; wherein the rim and the adaptor include respective mating surfaces, wherein the mating surfaces are inclined with respect to an orthogonal axis extending through the filter head, and the first inlet channel and second inlet channel define an elliptical shape adjacent the respective mating surfaces.