Use a 1/4" to 3/8" max drive ratchet wrench to get them pretty tight and you'll be fine without a torque wrench. The 1/4" to 3/8" ratchet wrench's shorter handle length will limit how much torque can be applied so you can't strip the threads but allow it to be tight enough to not leak... which doesn't take much. There is no need for a torque wrench for these two particular bolts. Just don't use a 1/2" ratchet drive on them.
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