wall 32 and urge the cartridge forward toward head 20 and will not permit the cartridge from sliding out of handle 22 rearwardly head 20 contains two rigid conduits 24 for water and 25 for air in the plug end of head 20 which joins with handle 22 by way of screw threads 26 the rearward ends of conduits 24 and 25 terminate in tapped holes into which tubular barbed prongs 28 and 29 are fastened by threaded shanks 27 on prongs 28 and 29 the filter cartridge has in its forward wall 31 two spaced passageways positioned and sized to receive prongs 28 and 29 inserted therein in a male female coupling prong 28 is coupled to water exit passageway 40 and prong 29 is coupled to air exit passageway 41 an alternate embodiment is shown in fig7 where flanged nipples 54 are screwed into head 20 and are attached to exit passageways 39 and 40 by sliding together and pressed against o rings 55 the pressure applied in screwing handle 22 onto head 20 supplies the pressure to seal o rings 55 tightly against forward wall 31 these couplings and the details of the filter cartridge can be seen in fig3 7 at the opposite end of the filter cartridge is rearward wall 32 and entrance passageways 41 and 42 which are coupled to flexible hose 43 conduit 45 of hose 43 carries water into the filter cartridge and is therefore coupled to entrance passageway 42 leading to semicylindrical space 35 containing water filtering material similarly conduit 44 carries compressed air and is therefore coupled to entrance passageway 41 leading to space 36 filled with air filtering material the.