example

CR (DZR) FITTINGS

Why use CR (DZR) brass and can it be used below the water line on marine applications? Corrosion Resistant (CR) brass or De-zincification Resistant (DZR) brass would seem as though they are two different metals, when they are actually the same. They are a type of brass that is designed to be used in harsh water applications, and are therefore suitable for use below the waterline on through hull fittings subject to the correct installation and hull material. To combat the de-zincification effect, raw materials are added to the compound and the fittings are heat treated during manufacture which ensures that the material will satisfy the requirements of the standard dezincification-resistance test. The reason they are put through this process is so that the zinc which is included in the compound of the metal during manufacture resists leaching out when in contact with salt water. This electrolytic corrosion is what causes fittings, seacocks or strainers to become brittle and fail. Other materials are available such as bronze or stainless steel; both can be used below the waterline on salt water applications. CR (DZR) brass offers a more cost effective option whilst still giving you the security of a having a good quality fitting which won’t deteriorate like a standard brass fitting would. CR (DZR) brass is made to an international standard CW602N and should carry the ‘CR’ (Corrosion Resistant) marking. All CR (DZR) part numbers are colour coded green . All fittings used for through hull applications must be correctly electrically bonded to ensure protection from electrolytic corrosion.

Composition Min.

Max.

Copper

61% 63%

Aluminium -

0.05%

Arsenic

0.02% 0.15%

Iron

-

0.1%

Manganese

-

0.1%

Nickel

-

0.3%

Lead

1.7% 2.8%

Tin

-

0.1%

Zinc

Remainder

Other elements -

0.2%

CR (DZR) BRASS THREADED SKIN FITTINGS

Maestrini threaded skin fitting made from dezincification resistant brass (DZR). This material is a brass alloy which prevents corrosion, caused by the loss of zinc in the fitting, making it suitable for exposure to sea water. Connects to a threaded pipe and is designed for through hull applications. Supplied with a fixing nut.

FITTINGS, VALVES & STRAINERS

403256 Inclined head

403205 Domed head

403223 Flat head

Inclined head

Domed head

Thread BSP Male

Thread length mm

Overall length mm

Head outside diameter mm

Flat head

Thread BSP Male

Thread length mm

Overall length mm

Head outside diameter mm

403252 403202 403253 403203 403254 403204 403255 403205 403256 403206 403257 403207 403258 403208 403259 403209

403223 403224 403225 403226 403227 403228

3/8” 1/2” 3/4”

53 58 66 71 77 78 95

58

34 40 49 56 65 72 84

1/2” 3/4”

58 66 71 77 78 95

62 71 76 82 83

40 49 56 65 72 84

63.5

72 77 83

1”

1”

1-1/4” 1-1/2”

1-1/4” 1-1/2”

84.5 102 132

2”

100

2”

2-1/2”

123

112

CR (DZR) BRASS HOSE TAIL SKIN FITTINGS

Maestrini hose tail skin fitting made from dezincification resistant brass (DZR). Connects to a hose and is designed for through hull applications.

403647

403305

Domed head 403642 403643 403644 403645 403646 403647 403648

Thread BSP male

For hose I.D. mm

Thread length mm

Overall length mm

Head outside diameter mm

Inclined head 403303 403304 403305 403306

Thread BSP male

For hose I.D. mm

Thread length mm

Overall length mm

Head outside diameter mm

3/8” 1/2” 3/4”

13 19 24 30 38 44 56

31 32 41 49 45 47 52

58

34 40 49 56 65 72 84

3/4”

19 25 31 38

51 52 52 48

90 93 94

44 54 64 72

63.5

1”

72 77 83

1-1/4” 1-1/2”

1”

102

1-1/4” 1-1/2”

84.5 102

2”

CHROMED CR (DZR) BRASS HOSE TAIL SKIN FITTINGS

Seaflow hose tail skin fitting made from chromed dezincification resistant brass (DZR). Connects to a hose and is designed for through hull applications.

DZR brass Thread BSP male For hose I.D. mm Thread length mm Overall length mm Head outside diameter mm 403403 3/4” 19 51 90 44 403404 1” 25 51 93 54 403405 1-1/4” 31 51 94 64 403406 1-1/2” 38 55 102 72

403406

114

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