Straight – straight sweat arresters are compatible with press-fitting systems, such as viega propress and all push-fitting systems Straight – straight compression arresters install on any ½" nom. Copper leg or riser and are especially popular in retrofitting ½" nom. Air chambers Straight – mip thread arresters install on any new rough-in or retrofit installation with ½" fip fittings Straight – pex miniresters are available with F1807, F1960 and viega pexpress connections Straight – products marked with the "no Lead" icon comply with national, no Lead product material requirements and also comply with NSF 61, which allows the product to contain no more than 0. 25% Lead