Similar in design to the 420510 series Glass frit (40-60 micron porosity) at the lower end to act as a support for column packing material May be used alone or in combination with 420570 series reservoir and 420575 series flow control adapters Custom sizes and plastic safety coating are available upon request 420650-0560 has a 50/30 Spherical joint 420561-0430 has a Rodaviss™ 24/40 Standard Taper joint (threaded in top) Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements