Stasis valve, clamp, tethered cap and 360° spinner. 360° spinning luer lock hub resists twisting and kinking of the catheter during horse movement. Helps prevent catheter disconnects by allowing extension line to spin freely 360° when connected to a catheter. Avoids accidental unscrewing. Easily position the extension set dorsal or ventral to allow catheter wings to lay flat against the horse for improved stabilization.