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SELECTION GUIDE

One chart for the classic Marelon range: vented loops, Y-valves, MF 849 seacocks, MF 850 ball valves, tailpipes, elbows, hose fittings, strainer reducers and the MF 810 strainer, with sizes and dimensions.

DocumentForespar Marelon Plumbing Product Chart
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LanguageEnglish
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Vented Loops & Y-ValvesSeacocks & ValvesFittingsStrainerMarelon DataProducts
Forespar Marelon Plumbing — Product Chart

Vented Loops & Y-Valves

Part no. Model no. Barb size Height Width
903000 MF 840 1-1/2" 5-1/4" 7-3/4" Ask us to source it →
903001 MF 842 3/4" 4-1/2" 3-3/4" Ask us to source it →
903002 MF 841 Vent Cap Assembly – – Ask us to source it →
903003 MF 843 5/8" 4-1/2" 4" View part →
903004 MF 846 Vent Barb Assembly – – Ask us to source it →
903007 MF 844 1" 7" 9" View part →
903008 MF 845 1/2" 5-1/4" 4-1/4" View part →
903009 MF 847 1-1/8" 7" 9" Ask us to source it →

The MF846 vent barb assembly can replace the standard MF841 cap/duckbill to vent outside the hull through a 1/4" hose. The duckbill one-way valve seals properly even with particulate matter in the fluid.

Part no. Model no. Barb size
902000 MF 852 1-1/2"
902001 MF 853 1"
902006 'Y'-Valve Parts Kit fits all sizes
902007 MF 854 3/4"
902008 MF 855 1-1/8"

MF 849 Seacocks & MF 850 Ball Valves

Part no. Model no. Thread size Height Height w/handle Base
904009 MF 849 1/2 1/2" 3" 4" 3"
904010 MF 849 3/4 3/4" 3" 4" 3"
904011 MF 849 1-1/2 1-1/2" 5" 8" 6"
Part no. Model no. Thread size Body dia. Body length Length w/handle
905100 MF 850 1/2" 1/2" 1-7/8" 3" 4"
905101 MF 850 3/4" 3/4" 1-7/8" 3" 4"
905102 MF 850 1" 1" 2-3/4" 4-3/4" 5-1/2"
905103 MF 850 1"-1/4" (as printed) 1-1/4" 2-3/4" 4-7/8" 5-3/4"
905104 MF 850 1"-1/2" (as printed) 1-1/2" 3-1/2" 5" 7-1/2"
905105 MF 850 2" 2" 4-1/4" 5-7/8" 8"

Tailpipes, Elbows & Hose Fittings

Tailpipes / hose connectors (glass-reinforced Marelon)

Part no. Model no. Thread size Tailpipe dia. A B C
905006 CF 252 1/2 1/2" 5/8" 1" 1" 2-1/4"
905007 CF 252 3/4 3/4" 3/4" 1" 1" 2-3/8"
905008 CF 252 1 1" 1" 1-1/2" 1-1/16" 2-7/8"
905009 CF 252 1-1/4 1-1/4" 1-1/4" 1-5/8" 1-1/4" 3-1/4"
905010 CF 252 1-1/2 1-1/2" 1-7/16" 1-7/16" 1-1/8" 2-5/8"
905011 CF 252 2 2" 2" 1-11/16" 1-1/4" 3-1/4"

Elbows (A = pipe thread size)

Part no. Model no. A B C D E
901000 HECM 8 1/2" 5/8" 7/16" 2" 1-1/2"
901001 HECM 12 3/4" 3/4" 1/2" 2-1/8" 1-5/8"
901002 HECM 16 1" 1" 5/8" 2-1/2" 1-7/8"
901003 HECM 20 1-1/4" 1-1/4" 7/8" 2-3/4" 2-5/16"
901004 HECM 24 1-1/2" 1-1/2" 1-1/16" 3-1/4" 2-3/4"
901005 HECM 32 2" 2" 1-1/2" 3-5/8" 3-1/4"
901006 HECF 8 1/2" 5/8" 7/16" 2" 1-5/8"
901007 HECF 12 3/4" 3/4" 9/16" 2-3/16" 1-3/4"
901008 HECF 16 1" 1" 5/8" 2-1/2" 1-7/8"
901009 HECF 20 1-1/4" 1-1/4" 7/8" 2-3/4" 2-1/2"
901010 HECF 24 1-1/2" 1-1/2" 1-1/8" 3-1/8" 2-3/4"
901011 HECF 32 2" 2" 1-9/16" 3-5/8" 3-1/4"
920207 MEC 8 1/2" 1/2" – 1-5/16" 1-7/16"
920336 MEC 12 3/4" 3/4" – 1-5/8" 1-5/8"

Female threaded barbed hose fittings

Part no. Model no.
901014 1/2" FPT to 1/2" hose barb
901015 3/4" FPT to 3/4" hose barb
905012 1-1/2" FPT to 3/4" hose barb
905013 1-1/2" FPT to 1" hose barb
905015 1-1/2" FPT to 1-1/8" hose barb
905014 1-1/2" FPT to 1-1/2" hose barb

Water Strainer & Reducers

Part no. Model no. Thread
901045 FTC 8 1/2" female
901046 FTC 12 3/4" female
901042 FTC 16 1" female
901044 FTC 20 1-1/4" female
901043 FTC 24 1-1/2" female
901041 FTC 32 2" female
901040 MTC 12-8 3/4"–1/2" male
901050 MTC 12-12 3/4"–3/4" male
901051 MTC 16-12 1"–3/4" male
901047 MTC 24-16 1-1/2"–1" male
901048 MTC 24-20 1-1/2"–1-1/4" male
901049 MTC 24-24 1-1/2"–1-1/2" male
910062 RB 24-16 1-1/2" male- 1" female
910063 RB 24-12 1-1/2" male –3/4" female
Part no. Model no. / description
906066 MF 810 Water Strainer
906067 MF 811 Gasket Set
906065 s/s Basket only
920178 Cover only

MF 810: Marelon body, clear polycarbonate lid, removable stainless steel basket; 1-1/2" ports standard (reducers for 3/4" I.D. hose sold separately); diameter 6.3", height 6.1"; flow rate 40 GPM with 1-1/2" ports. The bracket clamp lets you rotate the housing to aim the exit port.

Important Data

  • Threads: Marelon fittings have NPT parallel threads (as printed); seal with Teflon tape or plumber's dope. Bronze and Marelon fittings can be fitted together; take care not to cross thread.
  • Operating temperature: -40° to +176° Fahrenheit.
  • Maintenance: activate the valves regularly and lubricate with winch grease, Lanocote or water pump grease twice a year. UV stabilized.
  • A thru-hull installed less than 6" above the waterline must also have a ball-valve or seacock. In the typical head installation drawing, the 1-1/2" vented loop sits at least 10" above the waterline.

Thru-hull connectors

Forespar Marelon thru-hull connector drawing with A to H dimension letters

Forespar Marelon thru-hull connector drawing and A to H dimension table for 250, 251, 253 and 254 series

Marelon comparison chart

Material U.V. degradation Corrosion resistance Abrasion resistance Tensile strength** Flexural modulus*** ABYC* U.L.* Total score
Marelon 10 10 10 27,000psi 10 1,300,000mPa 10 10 10 60
Bronze 10 4 10 35,000psi 10 15,000,000mPa 10 10 10 54
Brass 10 0 10 45,000psi 10 11,000,00mPa (as printed) 10 0 0 40
Nylon 101 6 10 5 12,000psi 10 410,000mPa 4 0 0 35
Polypropylene 8 10 7 4150psi 2 75,000mPa 2 0 0 29
Acetal 5 10 6 10,000psi 5 450,000mPa 5 0 0 31
PVC 3 10 2 5015psi 3 434,000mPa 3 0 0 21

* Minimum physical properties required for approval: tensile strength 10,900psi 75mPa; flexural modulus 500,000psi 3480mPa. ** Value by test to ASTM D638. *** Value by test to ASTM D790.

Need a part that isn't listed? Ask us to source it and quote the part number from the PDF.

Products in this Selection Guide