together form a sealed connection with a conduit passing through them once gland nut 54 b is secured to threads 54 thus compressing the seals 54 a to seal against outer surface of the conduit illustrated in fig7 is a pin 112 a which is sized to fit through circular apertures 110 and 112 in the cover and body respectively when the cover 14 a is screwed onto the body 10 a and the apertures 110 and 112 are aligned this alignment is assured due the arrangement of the threads 50 a and 48 a and the cooperative interaction of boss 106 and shoulder 104 which engage each other preventing further tightening of the cover 14 a on body 10 a as described in relation to fig5 and 6 as illustrated in fig7 a the valve body 10 a includes an extension 100 similar in purpose to the extension 100 of fig5 except that the extension 100 of fig7 a is of a shape which allows the valve body 10 a to have an axis of symmetry on either side of a plane aa which passes through the inlet the outlet and bowl portion the boss 106 also has a shape allowing it to be readily die cast the boss 106 is sized relative to the threads 48 a and 50 a and the face 104 so as to function in the same manner as boss 106 of fig5 and 6 turning now to fig8 there is disclosed a valve operator 200 for use with the covers of fig5 and 6 the operator 200 has a base 202 which can be made from a plastics material or alternatively manufactured from any suitable material such as steel brass aluminium etc if a plastics material is desired preferably nylon 6.