disposable hd 1 filter element 16 the end cap 18 shown in fig1 and 2 has a knurled outer surface to allow hand tightening and opening removal fig7 9 show an alternative end cap 64 having a hexagonal head projection 66 the hex head 66 on the alternative screw on cap 64 allows for torquing the cap 64 open with a wrench not shown in case it gets stuck to the canister 12 during the time period of use fig1 12 show a first preferred embodiment of a clamp port nut 14 a distal side of the clamp port nut 14 includes a u00be inch square drive recess 68 for mating with a common u00be inch square drive tool not shown extending through the middle of the canister 12 before the hd 1 filter element 16 is positioned in place the proximal side of the clamp port nut 14 has an outer diameter of about 1 1 inches in diameter to just fit with a slight clearance within the corresponding proximal side opening through the canister 12 the distal side of the clamp port nut 14 is wider than its proximal side such as an outder diameter of about 1 u215c inches so the clamp port nut 14 can hold the canister 14 to the engine 28 while extending though the corresponding proximal side opening of the canister fig1 15 show a second preferred embodiment of a clamp port nut 70 a distal side of this clamp port nut 70 has a hexagonal profile 72 for wrench or socket tightening additionally the distal side includes recesses 74 for tightening with a screwdriver type of tool not shown extending through the middle of the canister 12 before the hd 1 filter element 16 is positioned in place although the.