Closure for a pipeline pig sender or receiver

A closure for a pipeline pig sender or receiver having a tubular body defining a diversionary passage, the tubular body having a pipeline end and a closure end, the pipeline end being connected to a pipeline with a valve selectively connecting the tubular body to the pipeline or isolating the tubular body from the pipeline, the closure end having a closure movable from a closed position to an open position to enable removal of a pipeline pig from the tubular body, the closure comprising:

• a primary closure body having an outer face, an inner face and a port extending therethrough from the outer face to the inner face;
• means for securing the primary closure body to the pipeline pig sender or receiver sealing the closure end when the primary closure body is in the closed position;
• a secondary closure body closing the port on the primary closure body, the secondary closure body being movable between a closed position and an open position to enable an operator to insert a tool through the port into the diversionary passage to manipulate the pipeline pig and release trapped pressure prior to opening the closure;
• and
• means for securing the secondary closure body to the primary closure body sealing the port when the secondary closure body is in the closed position.