The JMF Ductless (Mini-Split) Line Sets are offered with both the liquid and suction lines insulated. Insulation is standard black rubber, which is a closed cell and light weight elastomeric eaterial (in compliance with ASTM E96-00). The copper tubing is manufactured according to ASTM B280 and meets ASTM B1003 - standard specification for seamless copper tube for line sets; The copper is No. C122200 dhp (phosphorous deoxidized, high residual phosphorous). Meets ASTM E84 for smoke and fire (25/50) - UV resistant - R-410A approved - 45 deg forged flare nuts.