COMMUNITY FORUM

vcollura

04:54AM | 12/23/02
Member Since: 12/22/02
1 lifetime posts
Bvplumbing
We live in a 50+ year old home. The cast iron waste pipe is rusted through (a slight hole) leading to the septic tank. I've put a temporary patch on it. It needs to be replaced. It's a 4 inch cast iron drain - through the roof (for venting.) My question is when I replace the cast iron drain with PVC - can I reduce the 4 inch diameter to something smaller for venting up through the roof. Or does it have to be the same as the old>

boilrman

05:05AM | 12/23/02
Member Since: 12/11/02
12 lifetime posts
It should remain the same size. You can leave it there and just use a no hub coupling(rubber) to connect the cast to the plastic.

raymondvinzant

12:20PM | 12/23/02
Member Since: 11/17/02
50 lifetime posts
Well yes you can reduce the size of the vent. Since the vent required for a normal home is 3 inch, you can reduce to that size. Make sure you use the proper transition coupling to go from cast iron to plastic. Since the outside diameter of cast iron varies depending on if its service weight or extra heavy (even varies between manufacturers and year of manufacture), you will need a transition coupling manufactured by Mission or by Fernco. The coupling you need has a stainless steel sleeve with a neopreme insert. One side of the coupling is slighly larger than the other side to allow you to connect different outside diameters. If you can stay with four inch all the better, but if you need the extra space go ahead and reduce. In addition, if you decide to reduce to the smaller 3 inch size, you will need a 4 x 3 bushing. You could buy a 4 x 3 transition coupling, but they are much more expensive than the combination of a bushing and a coupling.
Good Luck
Raymond
Plumbing Prof
Anoka Hennipin Tech college
Click_to_reply_button
Inspiration_banner

INSPIRATION GALLERY



Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.

Reply_choose_button

captcha
type the code from the image

Anonymous

Post_new_button or Login_button
Register

All bookworms need a good bookmark that inspires them to keep reading. To make this colorful bookmark, cut a rectangular p... It turns out that many bath and kitchen cleansers contain chemicals that are dangerous to the skin and eyes, and often pro... So often we paint tiny nooks white to make them appear larger, but opting for a dark, dramatic wall color like this one—Be... Chocolate-colored walls and large window frames allow the exposed wood beams to take center stage in this small screened p... If you're not crazy about the idea of commingling plants and pool, this modern variation may be more to your liking. The s... Yes, a freestanding garage can become its own tiny house. Artist Michelle de la Vega has all the comforts of a modern resi... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... Pursue what's known as the stack effect. To achieve it, open the windows on both the upper and lower floors, and as warm a... Like no other floor type, a checkerboard design works wonders to underscore the retro kitchen theme. Vinyl flooring, ceram... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... When securely fastened to a tree or the ceiling of a porch, a pallet and some cushioning make the ideal place to lounge. V... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... For the cost of a can of exterior paint , you can totally transform your porch. Paint the floor a hue that complements yo... In this urban apartment, a standard-issue patio became a serene and green perch by replacing the typical concrete with gro... If you put the washing machine in the mudroom, you can stop the kids from walking through the house in dirty, grass-staine...
Follow_banner_a
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon
 
webapp1