This is an Aqua Ultraviolet 57 watt UV sterilizer in perfect working condition. I ordered brand new couplers for this, so you can reduce it down to your return line size. Specs can be found here. Located in 92646. $375
https://www.bulkreefsupply.com/57-w...D=9977&indexName=brs_prod_m2_default_products
https://www.bulkreefsupply.com/57-w...D=9977&indexName=brs_prod_m2_default_products