The Nu-Calgon 4175-10 EcoPure Charging Assembly is the simplest, most reliable and accurate method for charging R-290/R-600a systems in the market. The EcoPure Charging Assembly allows the ability to recharge the system with one gram accuracy! EcoPure Charging Assembly is for use with either the 13 oz. Can of EcoPure R-290 (4175-20) or the 14.8 oz. Can of EcoPure R-600a (4175-30) Refrigerants that meet the AHRI 700 standard with a 99.5% purity level. The EcoPure Charging Assembly securely holds the EcoPure refrigerant canister in an inverted position on a readily available market scale so that the system is charged with liquid refrigerant with gram-weight accuracy. THE NU-CALGON 4175-10 ECOPURE REFRIGERANTS CHARGING ASSEMBLY IS FOR PROFESSIONAL USE AND SHOULD ONLY BE USED IN ACCORDANCE WITH ALL REGULATIONS AND PROPER SERVICE PRACTICES. PLEASE SEE PRODUCT LABEL OR CONTACT NU-CALGON DIRECTLY FOR USE INSTRUCTION. IT IS RECOMMENDED TO UTILIZE THE APPROPRIETE PPE (PERSONAL PROTECTIVE EQUIPMENT) DURING APPLICATION.