e g drilling mud returning from a downhole environment where formation materials are being comminuted to create a borehole the mud is commonly a carrier for particulate matter that is not desired to be introduced to the gas trap system 10 for this reason probe 50 includes a strainer 52 the strainer 52 fig4 in one embodiment is a plate having a plurality of through holes 54 and which holes may be angularly counter sunk 56 strainer 52 also includes a through bore 58 for a shaft in one embodiment the collective surface area occupied by holes 54 is 50 square millimeters it will be appreciated that the primary purpose of the strainer 52 is to prevent ingress of particles to sample probe 50 and therefore the rest of the system the particular configuration and makeup of the strainer 52 could be altered without difficulty strainer 52 is connected to tube 60 through which fluid is taken up in order to keep strainer 52 clear of debris that might otherwise inhibit desired fluid flow therethrough blade 62 fig5 is in operable communication with the sample probe 50 in the illustrated embodiment blade 62 has four lobes 64 fewer or more lobes could be substituted although it will be understood that more lobes may have an adverse effect on total available fluid passage area depending upon both number.