Bump

Well, 3-230C is for cold water and 3-230H is for hot water, so they are not what you want. I am going to bet that 3-230 and 3-230B have some clear difference such as one is for a 1.2" supply pipe and one is for a 3/4" water supply pipe. If you look at the further details, look for the one thing that they do not have in common and you will figure out the difference. Do you know if you have 1/2" or 1/4" water supply pipes going into the shower?

The 3-1003-TR is a thermostatic valve and diverter in the same circle base, for a 1/2" water supply line. To see if it fits, go measure the distance between the center of the two pipes sticking out of your wall and see if that matches the measurement in the catalog description. You may have to look at the specification sheet.

It sounds like you may not know what kind of shower you have. Either it is a thermostatic valve with a separate on/off valve. In this kind, the temperature (thermostatic) valve is set at the temperature you want and never has to move between showers (unless someone who likes a different temperature showers between your showers). You turn on the on/off valve only, and can control the volume to any strength between off and full. OR, you have a pressure-balanced shower control where you turn it on and as you get it further to the right, it gets hotter and stronger. You can't control the strength of the shower water, except by turning the hot/cold control. The second piece coming out of the wall directs the place the water is supposed to go. It could be to a bathtub filler or to a shower head or to a second shower head, or to body sprays. Some control two things only, others control three. If you are not in California, some will let you turn on two at the same time.

With the builder telling you to get the diverter and valve, it sounds to me like you have a pressure-balance VALVE and need a DIVERTER to direct the water to one of two or three functions (shower head, tub filler...). But maybe not! You cannot be sure if you do not know what those valves sticking out of the wall are for. Are they 1/2" water supply or 3/4"? Is it a thermostatic valve or a pressure-balance valve? Is the other one a diverter to chose between tub and shower functions, or is it an on and off and volume valve for one shower head? Both of the valves you are showing are for thermostatic valves. Neither are for pressure-balance, so that is why the instructions to get a valve and diverter are confusing me.

By now, your builder will be back tomorrow, so all this is moot. But I thought I would try to give you a primer on the different kinds of shower controls so you would know more when you talk to him. Your other option is to go read the boxes of the Newport valves that are in your walls. Is there a box the builder throws things in to be seen in the work area? Look for the boxes the valves in your walls came out of and read their part numbers. Then go pull them up on the search box on the website and see what kind they are.