Abstract: A reusable liquid chromatographic column consists of three parts, a column body with an integral outlet port molded on one end, a sealing insert with an inlet port, and a perforated cap providing downward force to compress the sealing insert into the column body. A wedge-like seal is employed to seal the connection between the sealing insert and the column body. Two filters on both ends of the column body are used to prevent escape of packing materials from the column chamber under pressure. Hand tightening is adequate to seal the connection by screwing the perforated cap onto the column body. The column is reusable due to its simple disassembling and reassembling processes. It is also disposable due to its inexpensive fabricating materials and manufacturing process.

Abstract: The present invention is a kneeler seat for use in the kneeling or sitting position. The kneeler seat comprises first and second leg members each having first and second end portions and a seat engagement portion disposed substantially closer to the first end portion than the second end portion. Each of the seat engagement portion comprise an elongated cavity having upper and lower surfaces and first and second side surfaces. Each of the seat engagement portions further comprises first and second guide and retention channels formed in the upper and lower surfaces of the elongated cavity, respectively. The first and second guide and retention channels are aligned and disposed parallel to and between the first and second sidewalls. The seat member comprises first and second plugs engageable with the seat engagement portions of the first and second leg members, respectively. Each of the first and second plugs comprises a base portion and first and second walls extending outward from said base portion.