Dresser Style 40 Long Coupling - Cast & Ductile Iron Pipe

Dresser Style 40 long body couplings join pipe when the gap between the ends is wider than ordinary. Built like the Style 38 with a longer middle ring and larger belly diameter, they absorb the same expansion and contraction: up to 3/8 in per joint.

Application: Closing wide gaps on plain-end cast iron and ductile iron mains without a spool piece.

• 12, 16 and 24 in middle rings
• Absorbs up to 3/8 in expansion and contraction per joint
• Sized to cast and ductile iron ODs
• Fusion-bonded epoxy coating

NSF/ANSI 61 and 372 certified in Grade 27 and EPDM per Dresser’s 2024 Water Pipe Joining catalog. Only products bearing the NSF mark are certified.

Rated by size. Dresser’s 2021 cast/ductile iron submittal rates 4 through 12 in at 250 PSI; its 2024 catalog prints higher figures for some of those sizes, and the lower rating is shown until Dresser confirms. The allowable pressure on a job also depends on the pipe, its condition and the workmanship.

Source: Dresser 2021 cast/ductile iron submittal.

Plain-end cast iron and ductile iron pipe where the ends sit too far apart for a Style 38. Measure the OD before ordering.

Laying deflection per coupling (Dresser guide): 6° for 1/2 to 2 in OD and 4° above 2 through 14 in OD on 5 and 7 in middle rings; 2° (5 in ring) or 4° (7 and 10 in rings) above 14 through 30 in OD; less on larger sizes.

Sizes as listed in Dresser’s 2026 price lists; the picker shows the part number for each build.

• Clean dirt, rust, oil and loose scale from each pipe end, and check the gasket seats for gouges or grooves (Dresser installation guide, tag 0001-0737-999).
• Mark each pipe end at half the middle ring length plus 2 in, and center the coupling between the marks.
• Lubricate gaskets, pipe OD and middle ring flares with soapy water or a non-petroleum lubricant.
• Each pipe end must sit at least 1 in past the end of its gasket after deflection.
• Tighten nuts on opposite sides to draw the followers up evenly to the torque in the guide, and check every nut before backfilling.
• Anchor the pipe: the coupling provides a pressure seal only, and Dresser requires the joint to be anchored wherever pipe pullout could occur.

From the Dresser installation and torque guide for Styles 38, 40, 56, 62, 69, 71, 72, 76, 89, 128 and 168 (in the Data Sheet tab). Torque values stay in the guide.