@ OC Nub thx man, I went ahead and ordered the block adapter and fittings today, my room stays cool so I should be fine and like you said I can always add the second rad

@ Mastakilla, I was curious so I tested some clearflex 60 I had which is 3/8 ID and 5/8 OD and it went on without too much force but did grab so with a clamp I think 3/8 ID is good but 5/16 would be very snug and possibly a better seal.