Abstract: A releasable clamp which can be installed without using a wrench to tighten it on the fittings is disclosed. The lock nut and T bar embodiments enable the clamp to place a pre-set amount of clamping pressure on a pair of pipe fittings so as to minimize the gasket compression into the pipe's flow path.

Abstract: This specification discloses an in-line sight device sealed of a transparent tube surrounded by a tube body having a window. The tube body is attached to at least one flange via an attachment device which avoids any torque on the seal gasket. The flange and tube body are in direct contact with each other and the seal gasket is between the transparent tube and the flange having pressure applied in the same fixed volume and pressure each time the device is assembled.

Abstract: A pipe coupling clamp including a pair of clamp half members essentially C-shaped in cross-section each having a pipe flange receiving groove for receiving the mating flanges of two pipes to be coupled. The clamp half members being hinged together at one pair of ends by a hinge including plates and releasably connected together at the other pair of ends by a locking eyebolt and associated locking eyebolt nut hingedly connected at its proximal end to the end of one clamp half member to allow pivoting moving through a slot into an open securing jaw on the other end. The locking eyebolt includes, at its proximal end, an eyebolt seating portion connected to a stepped threaded portion of reduced diameter at its distal end. Thus, initially, on loosening of the nut, the locking eyebolt will not disengage from within the securing jaw.