Product#: TG-2820 Availability: This item normally ships within 1 - 2 business days. Description: Similar to 2815, except with a Teflon® stopcock placed between the coarse porosity fritted disc and the drip stem. The 2” ID column is supplied with a 4mm bore TeflonÒ stopcock, while the 3” and 4” columns have 6mm bore TeflonÒ stopcocks. Disc porosity is coarse, unless otherwise requested. May be used alone or as a component piece with column section connected by clamp.