Cartridge for MAKO PD-1503 or LAWRENCE FACTOR X65677. This industry standard 27" cartridge has a "MAKO" style connection which is used in many purification systems. Our AIM-677 contains the highest quality molecular sieve 13X for drying. This cartridge is most commonly used in the first chamber of a multiple tower arrangement.. This filter cartridge is housed in a clear tube with a blue indicator strip allowing the user to monitor the level of saturation.