I just moved into a new apartment and found these two fittings/valves under the kitchen sink. They are about 6.5" long appear in the 1/2" supply lines that emerge from the plumbing riser, between some shutoff valves and the kitchen faucet and dishwasher supply lines. Can someone please tell me what they are? I am planning to renovate the kitchen and these valves are somewhat large and in the way. I'd like to eliminate them, but not before I know why they are there. Thanks in advance!