bowl 24 and protect it against a damaging impact this conformable fit also insures maximum space utilization and weight saving advantages as with the bowl 24 the domed end of the guard 26 may have a drain valve aperture 41 through which protrudes the drain valve 33 extending from the bowl 24 where the bowl is translucent or transparent for insuring that the contents of the bowl 24 can be observed at all times the guard 26 is provided with observation apertures 42 along the longitudinal length of the guard 26 and extending circumferentially around the guard 26 the guard 26 also holds and retains the bowl 24 securely in sealed relation within the header 22 and surrounding associated fittings like the o ring seal 36 for accomplishing this purpose the guard 26 is formed with circumferentially spaced mounting nipples 43 adjacent to the open end the mounting nipples 43 are stamped or pressed from the guard 26 itself or may be securely affixed thereto the open end of the bowl 24 is cylindrically shaped without flanges nipples outward extensions threading or other means to directly join the bowl 24 to the header 22 the simplicity of the bowl substantially reduces problems associated with manufacturing the bowl 24 such as more expensive and complicated mold configuration this also eliminates one step in the mounting process or disconnect process as a user must necessarily remove the guard 26 in any event for engaging the guard the skirt 32 of the header 22 is provided with circumferential inwardly directed notches 49.