Valve assembly and method of assembly

A valve assembly comprising:

• a valve body defining first and second substantially rigid valve seats and a fluid chamber therebetween;
• a substantially rigid first valve having an unthreaded extension portion and a plug portion;
• wherein the plug portion is configured to be selectively seated at the first valve seat;
• wherein the extension portion is configured to extend within the fluid chamber past the second valve seat when the plug portion is seated at the first valve seat;
• a substantially rigid second valve configured to interfit with the extension portion to connect to the first valve for common movement therewith;
• wherein the second valve is configured to be selectively seated at the second valve seat, fluid flow through the fluid chamber past the valve seats thereby being controlled by common movement of the connected first and second valves;
• wherein the second valve defines an opening therethrough;
• wherein the extension portion fits through the opening and has a tip that is deformed to retain the second valve to the first valve;
• and
• wherein the first valve has a shoulder defined by an annular surface at an end of the extension portion, and wherein the second valve rests against the shoulder when the second valve is retained to the first valve.