Review on Dr Faucet Polished Chrome Shower Mixer Valves Wall Mount Bathroom Copper Faucet - Complete Rough In Valve and Trim Kit for Perfect Shower Tub Mixing! by Kofi Wills

Not sure what warm means in the review. In any case, the threads taper a little. To get a flush fit, unscrew some PVC adapters with large wrenches. Do it with a vise if you have one. Otherwise this thing will flow like crazy. Make sure it hits the ground. Basically after a few turns you have to touch your own threads. Operation is smooth and responsive after installation. Outstanding mixing process. This will give you the perfect shower temperature, just make sure these fittings are flush.