please take following steps to remove exhaust tee from an Alloy Star 2nd stage regulator:
STEP 1: pour some hot water (90C) into a rigid pot
STEP 2: soak the regulator in water until the exhaust tee is fully immersed
STEP 3: wait for 5 seconds
STEP 4: take out the regulator from the water and peel off the exhaust tee by hand
To put exhaust tee back, soak the part again for 5 seconds and install it onto the housing with hands. No special tool is needed.