Abstract: A small hatch cover is provided which is pivotably mounted upon a hatch cover mounting bracket attached to a car roof. A hatch cover strap is also pivotably mounted upon the hatch cover mounting bracket. The hatch cover strap engages the cover at the center of the cover and at the distal end of the strap, only. At the distal end the strap extends around the cover and engages the lower surface of the cover. A sealing gasket is attached to the lower surface of the periphery of the cover. The sealing gasket engages a conventional hatch coaming extending vertically up from the car roof. Slots are preferably provided at the distal end of the cover and the strap.

Abstract: In a sparger outlet, openings in a sparger loop are provided with specially designed check valves to reduce or eliminate the tendency of the lading to enter the loop through the openings. The openings in the loop include a hollow cylindrical seat portion. The seat member includes an opening in the interior portion thereof which communicates with the loop. The external portion of the seat member includes a circular seat adapted to receive a check valve in closed position. The seat portion may be formed in the loop or be a separate member. The check valve includes a stem portion extending through the seat, a tail portion which engages the interior portion of the seat member, and a head portion which in closed position seats on the seat. Either the stem portion and/or the tail portion is made of elastomeric material. The tail portion includes outwardly extending legs which engage the interior portion of the seat and bias the head portion into seated position on the seat.