threaded cylindrical aperture 25 of the diffuser base 21 set screws 18 are threaded through the apertures 27 in the diffuser base into the set screw slots 19 to secure the diffuser base 21 additional means for attaching the diffuser base 21 to the diffuser 11 are also possible for example it is possible to press fit the diffuser 11 into the diffuser base 21 and to secure diffuser 11 within the diffuser base 21 using a snap ring 65 within a snap ring pocket 67 as shown in fig5 the distal end of the diffuser 15 is capped by an end cap 17 within the diffuser 11 the regulating member 41 is operable by actuation of the modulating stem 43 which is attached to the proximal end of the regulating member 41 to move the regulating member 41 upwardly and downwardly so as to release either more or less steam through the steam diffusion holes 17 in the diffuser 11 a lower seal 47 is located at the distal end 45 of regulating member 41 the lower seal 45 may be a piston ring type seal so as to provide a better seal to reduce the likelihood that steam will enter the diffuser 11 around the distal end 45 of the regulating member.