Abstract: An apparatus is provided for use on a drilling rig for rapidly attaching a blowout preventer sub to the upset female threaded end of drill pipe, including a collar removably attached to the blowout sub, a horseshoe member slidably positionable on the drill pipe below the upset end and engageable with upset end, a telescoping frame interconnecting the collar and horseshoe member and an arm and linkage means for moving the collar and blowout towards each other so that the blowout preventer sub is brought into engagement with the drill pipe upset end after which the blowout sub may be rotated to threadably engage it with the drill pipe. After threadable engagement of the blowout sub with the drill pipe the attachment means may be removed.